Typically, the enclosure size is a big factor as well. Coensiding with the tuning frequency, the enclosure will determine, for the most part, how the sub is going to perform.
I would ask youself, " Do I want this sub to sound boomy or punchy." Take into consideration what you'll listen to most of the time. "Usually" the bigger the box, the boomier the sound. Of course the higher the tune, can also produce a more boomy sound at mostly higher frequencies at or above tuning.
Lots of factors can play a role...what is the Fs of the sub?