I have used ProPik straight and angled finger picks for many years.
Angled picks will work if your right hand isn't oriented to the bridge properly whereas straight picks whether they are brass, or steel will contribute to the sound you are looking for by picking the string or strings properly.
There will be many comments on this subject coming from a variety of players depending on their experiences over the years.
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I use mainly Dunlops, at least .0225” thick, the reason being FOR ME thinner fingerpicks tend to bend and get loose around my fingers while playing.

Since I play banjo, reso, and lap steel, I don't want to have to change picks when I switch instruments. Dunlop .020" brass works for me. I find the brass is more comfortable on my cuticles.

I've also used the ProPik split band #2 straight blade nickel picks, which is a lot of adjectives. I believe they are .025" -- I don't really hear a difference in tone that can't be explained by my playing, not the pick.

Bottom line, what works, works. I've never used anything thinner than .020, so no opinions. But I wonder if a lighter pick would sound thinner (no pun intended)

I was a ProPik split wrap guy for a long time then on one occasion when I was placing an order with BlueChip for a new thumbpick around 10 years ago I decided to give Sammy Shelor banjo picks a try. Plus a late friend of mine was a good friend of Sammy and used to handle sound years ago for Lonesome River Band.

Though I still use ProPiks on occasion, the Shelors have become my go to fingerpicks. The truth is, I never even thought about the thickness, and apparently they are on the thin side compared to what many players use on dobro. 

This is part of the spiel on the BlueChip site, where they are currently out of stock:

"The picks are made of high quality 304 stainless steel with a finished thickness of .0175".  

And this is how they are described from Sammy's site:

"About the nicest fingerpicks available. Highly polished stainless steel construction allows for very fast and crisp notes in a pick that lasts and lasts.  

Attention to detail and smooth polishing makes these picks very comfortable to wear. These picks fit similarly to the popular old Nationals, but the contouring makes for a better fit and better performance.  Available in the traditional narrow band, or a slightly wider band (10mm across) for more surface area contact.  

• Exterior surface polished to a mirror finish for buttery smooth string release 
• Inside surface left satin and porous to prevent slipping on fingers.   
• Blade is contoured for better string release.  
• These are the official fingerpicks used by Sammy Shelor and many other pros!"

The reason I'm including all this info  isn't to try to sell anyone on Shelors - but choosing fingerpicks goes beyond comfort and blade thickness. The features and benefits along with the overall design has made me a fan for around a decade. And I wasn't even aware of the blade thickness. Then I checked out the ProPik site (and what Peter wrote) and I see the split wraps are .025" - considerably more than the Shelors. Can't say that I ever really noticed the difference in thickness - but it's material - ProPiks are made from nickel silver and/or brass - Shelors are highly polished stainless steel. So even though Shelors are thinner, they don't feel wimpy at all when plucking the strings because they are stainless steel. 

I agree with Mark on this. I, like many, have also used the ProPiks, both split-wrap and single band for awhile after trying many others. They were great but I was looking to find something a little more comfortable as even the tiny holes would catch my cuticles and tear the loose skin. In looking, I found Rusty Thornhill’s Perfect Touch fingerpicks. They were much more comfortable and stayed put with their rough band interior, but noticeably thinner. I used the flat versions (in brass) and the tone was noticeably thinner and the picks flimsier than the ProPicks. I tried the round blade ones a little later and they were considerably stiffer and offered a much better tone for the way I pick. I’ve heard that they are thicker now since his daughter took over the company, but I had moved on by then. So, they are a perfect example of how nuances and slight changes in picks from one maker can make a world of difference, regardless of the thickness.

I imagine it was by surfing through Elderly Instruments’ website that I came upon Bob Perry’s cobalt plated fingerpicks. His Power Plus picks were the only other non-plastic picks I had ever seen with no holes in the band aside from the Perfect Touch, so I was intrigued. I ordered a set and other than trying a set of the popular Landis picks for a bit, I haven’t used anything but BPs in over a decade. Nickel-silver picks double plated in cobalt at a .025” thickness, these things are stout with tons of punch. A little tough to bend with the thickness and plating, but once I get a set bent the way I like them, they offer everything I had been looking for in fingerpicks.

I too agree with Mark. Probably have tried at least one set of every kind of pick on the market at one time or another but once I tried Shelors I was sold. They are most comfortable and durable, they stay in place and I suspect that they will probably outlast me.

I used the Shelors, quite comfy, but I just moved to Acri...they grab the finger in a wide enough area that the pick doesn't compress the finger surface when picking, which all other picks do, causing a movement and spring back of the pick...with the Acri you get a solid hit on the string...

I like heavier gauge picks. I really like the Acri picks for their thickness and comfort, and have used them for weissenborn and dobro for a long time but they just don't work for me on pedal steel - I have used Nationals (which are also pretty heavy) for steel for decades. Since I have to change back and forth several times in a theatre production I am currently playing in there was no way I wanted to be changing picks (what could possibly go wrong....) and I immediately discovered that it doesn't make much difference to me. I still love my Acris though.

I'm a big fan of the stainless Sammy Shelor picks also. Very smooth and glide right off the strings. I also bought the nicest set of fingerpicks I've ever seen from one of our own on this website that makes engraved picks. The inside has a special series of almost hooks that keep them from slipping off in the middle of a particularly exciting solo. The workmanship is fantastic and they are the thickest I have ever seen. Very easy to play with. The shape was a little different than the Shelors and it is hard to go back and forth. My memory is terrible but it may have been Scratchmo that makes those. The highest quality picks in my opinion and the thickest if you want to give them a shot.

Scratchmo = Ron Landis.

Sterling silver picks.

https://www.landisstudios.net/finger-picks

A 025 brass Dunlop set works well for me. They have a ringing tone that helps contribute to my strong picking. With the pedals and non pedal steel it’s the light gauge I use to gently play that’s opposite from the dobro.