Someone in one of the two Yak threads said that the 9T turns better. My experience is the opposite, and its not even close. The 9T reminds me of a Jug, it wallows around at low speeds and takes a long time to get to high speeds, which really aren't even that high. And it doesn't turn nearly as well as the Yak 9U. It does get better as it shoots off its ammo load, but it never gets to the 9U level. The reason the 9T is dangerous is its one hit kill capability and if you're a pro, the ability to shoot that weapon to long ranges. I'm not a pro, I miss with the big cannon all the time from point blank.
If you see me in a 9T instead of the 9U, I'm probably out to HO people vulching my field, or there's some tankers that I'm out to kill. Its also good for deacking fields, because your shot can be off by quite a bit and still kill the gun, and you can do it 32 times potentially. I still prefer the 9U for deacking, but the 9U is mostly ineffective against ground vehicles. I've been disappointed using it for anti-bomber, because you need multiple hits to take off a wing, not one hit blowups like on fighters. Its also slow to climb to alt and has a smallish fuel tank, making it a mediocre interceptor. Any of the 30mm armed Germain aircraft are far better choices.