Yes two strokes can be designed for either plenty of torque, or for very high power, this all depends on compression ratio, carb size, port height and pipe dimensions etc, and how they interact.

Same with four strokes, - depends on cam design, compression ratio, carb size, exhaust length, number of valves etc.

Not so sure about 4 strokes being lighter though, they've got more parts! but I guess two stroke pipes could be a bit heavier. ( correct me if I'm wrong ).

It's easy to say that 4 strokes have better torque than 2 strokes, but this is a just a simplistic and general description.

Sound? well I'd probably go for the 4 stroke.
Power to weight ratio? I'd go for the two stroke.