Both still get the same super high levels of practicality which a Volvo SUV has and other creature comforts. The built-in child booster seats (two of them) are superb as children under 12 years of age find them nifty. They allow proper seatbelt anchoring and allow the kids to sit taller so that they can actually look through the side windows without any issues. Volvo still have passenger safety in mind even in a very stylish looking SUV.
What differs in terms of setup are the larger 18 inch wheels on the T6 compared to the T5. Aside from the larger wheels, the T6 also gains a speed sensitive variable ratio steering wheel which adjusts the speed and rate of turn of the steering. The T5 gets a more linear powered steering but feels very weighty. But I actually like it more than the slightly artificial feeling variable ratio/assist wheel in the T6.
The T6 is actually reserved for the more powerful Volvos with the T8 for those exceptional ones with over 400hp or thereabouts. This T6 has over 300hp and 400Nm to play with and it feels powerful enough. It may be a large SUV lugging slightly over 1800kg of its own weight, but it is nimble on its feet as the engine feels potent enough to lug it along at most speeds. Give it full throttle from say, 2000rpm and the engine gets a little gravelly in terms of the noise it makes (the supercharger makes it like that) and it will squirm a little in your hands with the steering wheel tugging a little. Especially if you've just given it everything mid-corner. 0-100kmh is easily despatched in slightly under 7 seconds. 200Kmh comes easily if you have the nuggets for it. Stability isn't much of an issue as it feels planted in a straight line.