If you do a lot of climbing, you might appreciate a pair of road shoes.

I have had mountain or rather cyclo shoes with a rubber sole since I started cycling on the road last Spring. I am now getting a pair of (awfully expensive - big gift to myself) Shimano road shoes with carbon soles, and Shimano 105 pedals. Force transfer from leg - foot to the pedal is much more efficient with stiff soles. Probably not a very significant difference in terms of speed though. But I hope them to make climbing less tiring for my ankles in particular. Not good for walking a mile, but okay for hopping off the bike to the washrooms and convenience store and back up that hill! But I will keep the other pair for commuting and any activity where I might have to walk with the bike up or down stairs.

Otherwise, it doesn't really matter.