Turnigy Flightmax vs. Zippy Flightmax

Hey pilots... im getting ready to buy a few 6 cell lipos. Im building a Great Planes Extra 300S. So far i acquired a O.S. 5020 400kv motor using a 15x10e apc prop. Their test results say i will pull 60amps set up this way. They recommend an 80amp esc. I bought a cc ice 75amp esc.

Obviously I want quality. Ive used Turnigy lipos in the past. Zippy is cheaper. They both carry the flightmax name. Whats the difference and how do they compare?

Im calculating a 20c battery as being sufficient... 20c x 5 (5000mah battery)=100 amps max output? Is this correct? Thanks much for the input!

I've bought about 18 2200mAH 3S Zippys and Turnigys (half and half) -- no duds in any of them. I imagine (haven't actually tested so it might be a false impression) that the Zippys hold up a little better towards the end of the flight.