There’s reasonable differences here, at a glance War Thunder has everything aside from infantry combat, while World of Tanks has just tanks. Warplanes and Warships are two different Worlds. A little deeper, and WoT has a more arcade gameplay so while it’s still fairly realistic as far as mechanics, there’s things like health bars, medikits that can instantly heal crew members (that might be temporarily unavailable due to high caliber tank shell through the armor, and into them…), plus some balancing of things to at least try keeping the game fun. War Thunder is a more realistic experience, with fun things like being hit across the map, then having the shell shatter into the tank and killing the crew so that game is over for you. Regularly. I do like their warplanes though.

There’s also Armored Warfare, but that’s a forgotten one because it was a World of Tanks clone with modern tanks, it got mismanaged to hell, sold off, and then the new management turned out epic greedy. Mir Tankov is, for lack of better words, the Russian offices of World of Tanks after the invasion, so they saved face by cutting ties with what was technically the headquarters. There’s WarBirds, that’s probably 20 years old by now and it shows. Warplanes: WWI Fighters is a lovely VR game that channels your inner Red Baron thanks to realistically arcade physics.

Yeah. You didn’t ask for any of that :D

Edit: and I just realized it was about the War Thunder forums. Oh well.