The two games really aren't comparable. WoT isn't a simulation at all which makes things really predictable and a large segment of PvP players want predictable. They want a hit to take off 5 or 10 or 20 hit points. They don't want to win or lose a fight because something procced or something crit or something missed.
In AH GVs this manifests itself in the frequent complaints that "I shot him five times and they all bounced off but he shot me once and killed me! That's BS!" This happens because AH does not have a hit point system for tank armor (it does for the components of the tank that are protected by that armor, but what those are and what gets through is invisible to the players) and instead tries to simulate the armor and the rounds, including the angle at which the round strikes the armor. This is very complex and variable, and that leads to its seemingly being random and uncontrolled. Well, welcome to realism.
WoT fixes that by using hit points and that makes it very predictable (Note that this isn't saying there is no skill to the game or that match outcomes are predetermined, just that you know what a hit will do. You can predict the effect of your tactics, if they work, to a T.) and that is a big draw for PvP as a sport type of players. AH will never compete there as far as GVs go. AH is very much a hit point based game as far as aircraft go, so it PvP as a sport players are a lot happier with the airplanes, if airplanes are their thing.
This is not to say AH's GV gameplay doesn't have serious shortcomings or compromises enforced on it by being tied to an airplane game as it clearly does. The terrain graphics are well below where they ideally would be for a tank game, not just in terms of being pretty, but in terms of tactical complexity as the game world is, still, largely flat planes (yes, plane as in geometry) with sparsely scattered bumps.
So, if your thing is GVs and you either don't mind the GVs not being simulated or even prefer them not to be simulated, then WoTs is going to be better for you. If you want more simulation and don't mind the shortcomings of the GV game forced on it by being tied to an airplane game, then AH is the place for you.
