Man, the difference is night and day. Legends authors actually did a fabulous job turning a one-off appearance in TPM into a fully realized character of his own, and the thing that's burning my ass right now (out of many things which burn my ass about how they handle him) is that this was all canon during his TCW run. It wasn't wiped until 2014. This isn't like some EU novel written in the eighties, a lot of Maul's most interesting stuff was written within the past decade!