It's hard to say since I've not heard them all yet.
But based on what I've heard I have to say that, R2R is propably the worst one. While my favorites are TJR and ASOP (atm), I shall see what I find once I get my hands on CC, Take this life sounds fine.
It's a battle between Subterranean, The Jester Race, Reroute To Remain and Come Clarity for me ... I think; my vote ended up going for The Jester Race, though.
Whoracle is their best album and the one I voted for. The Jester Race is their second best. Both of those albums are nearly flawless. Colony is very good too, with only a few weak songs here and there.