El-P is at his best when he's on his weirdo kick or whatever y'all want to call it. I'll take I'll Sleep When I'm Dead, Fantastic Damage, and Cancer 4 Cure over the majority of Mikes mostly uninspired solo work.
Is RAP Music part of his 'mostly uninspired solo work'? I actually think RAP Music is the best album out of all. It boils down to Mike being a better rapper (he's a better songwriter, much better narrative skills/storytelling than El-P) and I also think he sounds better on El-P's beats. RAP Music is also more well-rounded in terms of the subjects it covers.