Just personal experience, but I've had more fun since almost inception with WTGF than with WoT. Maybe my good memories of WoT are fading and it's coloring my perceptions, but in the end I've found that while WoT is a good, almost MOBA game, WTGF, especially now that everything is combined arms, is the better product for me. One of the best things in WT is there is no need for "balance" to the obsessive degree it's needed in WoT, as I've run T1 gimmick builds (your lineup is considered a build and you can have multiple of them) into T4 matches - an M22 Locust is terrifyingly relevant even in late game due to being the smallest tank ingame with a still decent gun and high speed. Planes are fantastic equalizers, the module damage mechanics are better overall for reducing frustration while adding a different layer compared to WoT. The only time I've not had fun is when I've slipped back into WoT mode and been more concerned with hard grinding out a tank. Better players and better play is rewarded at a higher rate, and the closing of a close game is usually tense because only the best/luckiest are still fighting. I love the complete lack of enemy spotting, both for having to hunt them down and for the invisibility it grants me (see M22 Locust above).
If they added armored cars and infantry I'm not sure I'd play anything else. Caveat though, I only play realistic because arcade is ugh...special...and simulator is borked (and I have no joystick and would be an active hinderance to my team).
I dislike the expense associated with the crew, but not the model itself. I kind of dislike the huge loss in energy transfer when rotating compared to WoT, the lack of agility can be damning sometimes. I somewhat dislike getting instagibbed early on when making a bad move, but I've adjusted my builds to compensate.