I've played several games of Suburbia and I personally feel Odin has massively greater replay value and strategic variety. Plus I like the viking theme, haha. However, I haven't played the Suburbia expansion(s).
I agree it takes a lot of table space though. For solo play I have a circular table about 4 feet across and it's basically full.
Also, feel free to check out the solo challenge thread in this forum if you want to join our weekly community thingy.
I intend to get into the solo challenge no question. Suburbia is #1 at the moment only because I have had more play time with it. Feast for Oding certainly has a lot more strategic variety from what I've seen. I really like Suburbia because you don't know how the tiles synergy will go. Both have it's +s for me at the moment. granted both don't have the win/lose aspect that many crave for.
Right now it's a beat your best score with what you get. Nothing Like Terraforming Mars where you win or lose and then you want to get your best score. Not that it's a bad thing but many solitaire games or variants have the 'Beat your high score' aspect that gets a bit tedious.
Makes Terraforming Mars a game I'd like ASAP. (Nowhere in stock that I see and I won't pay $100+ for it. *cough* Amazon *cough*)