uTP never changed. Though, there are some tests here and there that say mixed mode (TCP + uTP) can be faster, one just needs to wait a few minutes for uTP to ramp up. I generally still recommend TCP only, though, the difference is marginal.
Still UDP, so uTP will behave similarly.
Then maybe in your case mixed mode is indeed better. It's not like having this enabled will somehow cause your OS to uninstall. Or manipulate the weather around you and spawn an EF5 tornado on the spot. As written, I usually recommend TCP only because in most cases it just avoids headaches.