Been to both places, and I would not go back to WS. Whistling is very nice, don't get me wrong, but personally, after playing the Straits twice, I have no interest in playing it again. I felt the bunkering to be un natural and over the top. I felt that the Irish, the Meadows and the Straits were all inconsistent in their design and at one point or another, all gave in to the constraints of the property or irrigation requirements. The River Course was the only one that stayed true to itself through out. All that being said, the hotel is very nice, the staff extremely courteous and helpful. The dining options were relatively limited, but what was available was very good. Am I glad I went, yes. Would I go back, no.
I have also been to Bandon, and can't wait to get back, the golf is far superior, as is the overall environment and facility. If you haven't been, you need to get there first. Chances are, after that, you'll want to go back before going anywhere eelse.