@alyssa In-battle, or in-world?
@gaditb my choice is based on the combination and i'm not going to make two more polls :)
@gaditb well, strictly speaking, my preference is based on the combination of field effect, battle effect, and pokémon that learn it
responses
@gaditb also Surf kind of drags down the other Water-related HMs for me because (except for Waterfall for physical attackers after Gen 3) it's generally a better battle move than them, and having to fit one or two extra water HMs can make things a bit awkward and necessitate splitting the Water HMs across multiple mons.