Undoubtedly, it's easier to use 2hbh for topspin returns of serves.
BungalowBill is correct here. Open stance is fine, since time is of essense. Little shoulder turn is needed, since the pace of the fast serve provides your power...you're really redirecting it back higher than it came, with, as said, a combination of top and sidespin.
If you have time to slice it back, you have time to attempt a top/side spin return. It IS harder to hit clean, some balls might go long if the serve is big, and of course, the MAIN problem is if the serve is hit really wide, you've committed to a topspin swing, so your reach, the controlled one, is lessenned.