Wrote this in another thread on same topic - for 99% of the game, all 3 tanks are roughly equal in capability and functional use. So it comes down to what do you think looks coolest: giant axe, giant sword or sword/board.

End of the day, there is a tiny amount of the game where meta obsessed FCs and premade groups might resign WAR-DRK to OT, if invite them at all. IMHO, if that happens to me, you or anyone...make better friends, join a better FC.

So pick - giant axe, giant sword, or sword/shield. Everything else will be roughly equivalent.