The Prius is too large to consider it at present, physically too large
Why so? Parking or driveability? It’s an extremely easy car to drive if that’s the issue, it really is a lot like driving a small car. Tiny bonnet, light steering and controls, and a high up driving position with a great view. Plus many are around with reversing cameras and self parking.
TSI is not old. It’s FSI with a turbo and sometimes a supercharger too. FSI is direct injection petrol which means that rather than filling the whole cylinder with air/fuel mix, it fills it with air and squirts in a little bit of fuel like a diesel. The clever part is that the injector and piston head are carefully designed to ensure that the fuel hangs around the spark plug just long enough to ignite, and with jut enough air.
Bloody clever it is, and only possible with modern tech and computer design iirc. Having said that other manufacturers do it too. Popular in the US where diesels are not.