Picks Or Fingerstyle?
Both. In my own humble opinion, please learn both. Someday, you will be glad you did. I had the callous on the end of my middle finger peel off one Friday night, first set. I had an open wound and there was no way I would have been able to fingerpick. Thankfully, I had taught myself to play with a pick when I had first started on the bass. It not only saved me a massive amount of pain, but allowed me to play the rest of the weekend.