I still play WoT on my PC, but have recently turned to the Warships one and have dropped WoT. Its just the usual thing "oh, new shiney!" obsession and will probably return to tanks eventually. The satisfaction of sinking an enemy Battleship or carrier with torpedoes is quite good. I would recommend having a go.
Agree with SpaceCudet, the Warplanes version is shit. If you are into flight sims, there are much better out there.
I have paid money on WoT occasionally, but if you can stand the grind you can play for free no probs. Never needed to spend on Warships one.