It depend on the size , Width and placement of the fin . I fin the is wide at the base and dont narrow out or doesnt have alot of rake with give hold for tip time and take a little bit of effort to turn on a dime with. while a fin that narrows out alot or has a lot of rake in it will be really responsive. Also size of fin compared to the size of the board has to be thought about as well
zach, i think you've been riding the wrong fins in your singles.
As others said there is a lot that it depends on. For me a 10" pivot covers just about all conditions.
But sometimes a fin with a nice rake is nice, or maybe the Rainbow El Gato fin can be a lot of fin. Heck I've even rode a quad set up on my favorite board it's a 4+1, but even that board I mostly ride as a single.