IMHO Animal man is more accessible, both the story and the physical book itself Except the art, because that sucks in AM.
Also, DON'T look up anything about it. NOTHING! Seriously. Basically the first thing everybody mentions about AM is the twist at the end, because it's a 30 year old run and they think everybody knows the end already. It's much, much more interesting if you don't know what the whole thing is about.