DBZ? One Piece?
There's so many things with tons of episodes and repetitions and fillers.
Again, by that logic...
Haven't seen OP yet (I won't even consider watching the anime at this point tbh, I'd go with the manga but I still can't comment atm) and DBZ wouldn't even make my top 50 animes list. I stand by what I say most series can't go on that long, the only way it can go for hundred's of episodes is if it's popular and the creator just doesn't care about ending it.
I'd still take DBZ over Bleach for 2 reasons: It's still shorter and it's less pretentious. It isn't trying to be clever.
In terms of time investment I still wouldn't really recommend DBZ to anyone who is actually looking for a quality story and if I did I would suggest the much more reasonable Kai or hell, even the abridged version over the original.