I started out on bass, and for the first year or 2 I used a pick. Then I actually learned how to really play (besides being a tuned bass drum) and mostly used my fingers and learned to slap (decently), and used a pick here and there. This has helped me develop a good finger style for guitar, and classical guitar as well.
Playing electric guitar, I always used whatever my friends had, since I was always playing their guitars because I didn’t own any. But now I usually prefer Dunlop Tortex, 1mm or a little thinner, otherwise I’m using my fingers.
For bass, when I’m not using my fingers, I use either a Cymbalic pick that I bought years ago that aren’t made anymore, that were made from cymbals, or I use a titanium pick that I’ve recently found, custom made by a guy in Germany.
I normally play Ibanez 5 string basses from the early/mid 2000s, and the metal picks give the bass sound a certain dirty grind that I really love, especially combined with Traynor and Hartke amps and aluminum speakers, along with other pedals.
I wouldn’t mind checking out the regular picks with better grips for guitar, I’ll have to order some and check them out. Picks can be a pain in the ass to hold on to/keep straight, especially the more you play.
It's a boost booster, to boost your boost - it makes your tone much muchier.