neither, the raspberry pi doesn’t have a gpu to deal with transcoding so it’s gonna be frustrating when ur trynna watch or listen to anything (its gonna keep buffering). i highly recommend checking out your local auctions from big business or government that are giving away old mini computers and use that as a self-hosting measure instead (no more than 100$). raspberry pi is kind of a scam ngl since you can get much better hardware for cheaper, ur paying for a brand image
what sort of stuff do you play on plex? and do you use the pi for other hosted services?