Pattern all of them, then decide which you think offers the best result. They all work well depending on what range you commonly shoot. In my opinion, imp cyl is the best choice if most shots are inside 40 yards, again this is only my opinion.
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whatever i'm doing i'm thinking about crow hunting
IMO choke selection should be based one's skill with a shotgun. We don't eat crows so a tight choke on a close bird is not a concern for ruining meat. How are your scores in trap and skeet, are shooting well, say 90% average or better? If so a tight choke will extend your killing range and not hamper you much on the close one's. If your clays scores are not so good it would probably be best to use an open choke and stick to shooting slow and close birds.