This is a good question.What kind of snorkellling? Mixed with some shallow free diving or just surface snorkelling?
I don't buy special fins to 'flap around' doing some shallow diving with a snorkel going over a coral reef.
I do fee dive [not to the depths I once did] , for this I use blade style fins, Mares Pure Instinct Razor Pro Fins, these are mid range in price, light but a bit long for travel, but worth it, If you can fit them in.