TSS has worked great for me. The only other thing I tried was TopFin bacteria supplement and that was worthless. Walmart has the best price for the TSS. Check the expiration date and get the one with the longest time left. Also, before you use it, shake the living daylights out of the bottle first.
I've tried API QuickStart, TSS+ and Stability. QS didn't work very well but I used it before I knew you had to shake the bottle really well. TSS+ cycled a 40b in 4-5 days but I left it alone for 2 weeks before a water change. Stability had almost no noticeable effect on 2-3 new tanks.