I'd think that X would be the most tricky one to work with in this stage. Still, since you automatically bring in a second teammate, you wouldn't be stuck with X... unless you're crazy enough to bring Alia along. Though, I suppose it's not so much that it's harder for X as much as it is EASIER for Axl and Zero who can aim in any direction and slash up everything within radius respectively.
And the most painful part of this stage? Definitely the later platforming segments. A friend of mine was too stumped to get through it... it took him about ten tries before he gave up on it. Well, whatever.
Enough of my ranting about what it's a picture of, let's actually look at the picture itself, shall we? Maybe I forget to comment on the art itself because it's so convincing, but I really should actually mention how good it looks once in a while. Just, y'know, to be fair.