I mostly use a thumbpick and my nails for electric and acoustic guitar. Jim Dunlop, plain old white plastic. I like 'em tight so I use the smallest ones I can find. They give me a lot of flexibility, I can use the TP as a flatpick or as I usually do in a kind of flatpick/fingerstyle hybrid. If I break a nail, I have some "press-on" nails that work pretty well. On the rare occasion that I use a flatpick, just a JD USA Nylon, grey, .73. Really simple and boring. I also use a TP and metal fingerpicks when I play banjo. I "cut my teeth" playing Merle Travis, Doc Watson, Dave Van Ronk and various old country blues. Along with playing the banjo, it just simplified everything to use a thumbpick.
Lots of cool options here though.