Among the Stars is one of my favorite games; I have all the expansions and I love it. However, I've been more and more interested in getting Roll for the Galaxy, and I'm just concerned that they might thematically and mechanically overlap too much.
I've never played Roll, so I could be way off. Have you played both? If so, can you tell me whether they both have a place in a collection, or whether I should definitely choose one or the other?
I won't comment on similarities in theme because I never pay any attention.
I would have to say that gameplay wise they are very different. I own both but am selling roll for the Galaxy, didn't like it at all. I hate dice in games but thought that the way roll uses dice was very clever and not the only reason I didn't like the game. I think it was the game end condition and not feeling like I had really done much in that time. It may be a game you enjoy, and I def don't think it's a bad game, just not for me.