Pick all the way. I started out fingerstyle like everyone else and after getting my first picks I intended to play 50/50. When I started my YouTube channel I decided to go pick full time. Its louder so i can be heard over the music, its always been more comfortable and my playing improved after I made the transition.
I always thought slap was a technique like popping or tapping and not a distinct playing style. Learned something new I guess. In any case ive never done it, kind of over rated I think.
Finger style for slower songs and country…getting use to the picking for the faster, heavier songs. Like Rapid Fire from Judas Priest…I would use a pick.