Dry is best, IMO. If you don't have a lot of time, but want your ribs to fall off the bone, so to speak, you can boil them on high temperature for 45 minutes, then let them rest. Prepare your dry rub, then throw them on the grill for 10 - 15 minutes. Believe it or not, that is how many restaurants do them, but instead of boiling them, they might steam them.
CK