I almost never had the GTI on the floor, and then only briefly to see how it would respond. I've never had the Tuscon on the floor.
I tried the GTI a bit once but had it in Normal mode, and it detuned the engine to keep the wheels from burning. It bogged it down. Aha. Next stop light I put it in sport and it didn't do that, the front tires chirped quite a bit.
The Tuscon has a "Sport" mode that changes the dash display and little else, maybe the shifts are different, it's pointless. There is also a "Smart" mode which is ... a nothing, as well as "Eco" and "Snow". I just leave it in Eco.
The most fun was driving the CTS-V at COTA, they told us to put it in Track 2 and hold the brake, hard, and hammer the throttle. That was a handful.