Vodka mixes with anything, except kool-aid (DAMHIK). It has no taste by itself, that's why you have to spike it with marshmallow flavoring. (I can see a S'more in the making. Just add some chocolate liqueur and a graham cracker).
Gin comes ready to go right out of the bottle, often with a splash of tonic water,or a 'wee dram' of vermouth, as God intended. I, and the Dutch, have known this for years, well before the Harvey Wallbanger was in vogue. Well before.
Rick