Myself, I’ve enjoyed Suburbia every time I’ve played it (despite, I think, never winning a game); thought the CoMKL variation introduced some awful changes (despite winning my game of that), and didn’t enjoy Isle of Skye any better (I think I did come last at that one).
I disliked Skye largely on account of the auctions, and I disliked Castles largely on account of the appalling AP-triggering “choose the optimal sequence of these tiles every single turn” which made every turn a drag, sapping most of the enjoyment out of it in my group. By comparison I’ve found Suburbia breezy and fun, every time.