It's interesting to see that we got the whole range of responses...14.1, 9ball, 8ball, snooker, one-pocket. However, I'm still not convinced I would take 14.1 over rotation when it comes to versatility on the pool table (actually, if we include snooker, i would pick snooker over 14.1).
Straight pool is much more of a mental game than a physical game. To play straight pool correctly, you need to know the correct patterns, break balls, and key balls in order to make physical execution as easy as possible. If you choose your patterns correctly, there would be no need to shoot table-length backcuts or play 3-rail positioning routes.
As for rotation, it's definitely more of a physical game than a mental game. As with all rotational games, you know exactly what ball to hit next and what ball to hit after that, so that part of the mental game is non-existant. However, rotation is much more taxing on one's cueing skills than straight pool. You need to consistently make table-length shots will all types of spins and with all types of speeds.
So I guess the question now is...can one adjust more easily to something that is more mental or something that is more physical? I argue that it's easier to adapt to something that is mental than it is to something physical. It's easier to learn proper pattern-play than it is to learn how to effectively execute two-rail kick safeties. This is why I would pick rotation over 14.1, because in rotation you pick up essentially all the physical and cueing skills required to play any pool game.