IIRC on the Suntour you can specify different weights for the rider which can help if it's going to bottom out, but it is of course a compromise with only really about 35 to 50mm of travel at best. A great compromise in my opinion though.
One thing that hasn't been mentioned is the slightly weird feeling you get with the Suntour because it's this neat parallelogram. As it operates to smooth out the up and down movement, it also introduces back to front movement as well - so the distance between your bum and the handlebars increases. This doesn't happen with a sprung seatpost of course.
Mike