Both work well, I use the stylus only when items are too small to be easily pressed by the finder such as small urls. But for listviews and gridviews finger should work well.
Yes I dit use mouse areas in my delegate and I had no conflict at all, qml works just as well on resistive screens, you just can't use multitouch gestures such as a pinch gesture but otherwise it behaves exactly the same.
On my nokia n900 with resistive touchscreen and the app was also tested on a resistive nokia 5230 as well as several capacitive android phones without having to modify anything at all.