Hi Josh,
I am not that picky with the old Stanley planes, and like a range of types. I would be happy with any from the type 10 to type 15. Do I have preferences, yes, like Jim and some of the others, the big adjuster, but that is not a deal breaker, also, another +1 on liking the keyhole slot on the lever cap. Again that is not critical, as any reading of the builds seen on this forum will make clear.
I have to say though, I also like the bedrock planes, but my reason is partly because I am not as skilled as some of the guys at fettling the planes. I do a fair amount of it, but IMHO (and only an opinion), the bedrocks need less fettling. All of my Stanley Bailey planes are type 10 to type 15s, except one that belonged to my dad, which if memory serves is a type 19. That plane is family connection, and you can't compete with family collection, at least I can't.
If I suddenly woke up and had to pick only one type of Bailey to use, (I wouldn't give up my dads or grandfathers planes), it would be a type 11 with an add on big adjuster wheel.
Stew