Not sure, but MAL says the first season will be 24 episodes. New opening era introduced a lot of new characters- moreso for the arc that's happening right now than because it'll be long, but I really can't see this show just being a 2 cour.
But to keep you at ease, I definitely can't see it being half the length of a fight shounen.
I'd say the anime, only because it's airing. I haven't read the manga but I've heard almost equal praise about both. I'm personally following the anime since it's been pretty great and "budget" doesn't seem to be in its dictionary. Plus, the OST and voices really add to it. Plus it's only 20 episodes in, so it's not exactly imposing.