Myself I recomment the Bio-Spira. If you have the extra money and can find it in your area it is great. Fishless takes a while to complete the cycle. Bio-Spira technically says fish safe within 48 hours. I still would give it at least a week and test the water, for Ammonia, Nitrite and Nitrates, prior to getting the inhabitants but this is much better then the wait of Fishless Cycling.
Just my opinion,
Curtis
Just my opinion,
Curtis