Fast or extra fast action

I recently bought a St. Croix Mojo 6”8 medium Fast and Extra Fast, at a garage sell for $10 each both in perfect condition, I wanted to designate one of them for top water only. Wanted some input of the fast or extra fast would be better.. it’s going to be a few weeks possibly months before I can test them out on the water, as I am still rebuilding from the hurricane and I’m working 7 12s.. Thanks