I began playing bass at 15. I exclusively played fingerstyle, followed Chuck Rainy's advice in his book about a light touch and using some fingernail. Also slapped a bit because I was a big Flea fan in High School. As I entered the workforce I had less time and opportunity to play bass with a group so I transitioned into an acoustic guitar player and songwriter. Mostly fingerstyle there too. I started playing with a pick in my 30s as I got into electric guitar. I also started home recording and playing with people regularly. I would rarely play bass, always a borrowed one, and only fingerstyle. Last year I bought a bass to have in my studio. I became hooked again, but still only played fingerstyle. I now play in 2 groups and sub in a third. As a lark last week I grabbed a heavy pick and decided to rock out one day in my garage. It turns out all the pick skills I gained playing guitar are transferable! I guess I was never any good at using a pick as a young man. Now that I am I can't get over the versatility! So many sounds just from changing angle and palm muting. I'm a convert. Fingerstyle will be a secondary technique for me moving forward. Tl:dr. Used a pick as a guitarist: turns out I'm goid at it on bass now too.