New MarketGod users are recommended to use the latest release at any given time. Our releases of a new version occur when we've found a new buy/sell criteria that provides less noise and false positives or is better on lower time-frames, than its predecessor. In theory, MarketGod v8 is much more reliable than MarketGod v5, etc. That said, depending on the market being traded, users find success or prefer one over the other. Hence our flexibility in enabling users to choose their preference.