Okay, let's see if I can overcome my crippling bias and give some sort of answer to the thread.
I haven't yet played Rye. However, I did get to play Sandwich twice during my trip to the UK. I played it once in early February, when it was 40 degrees fahrenheit at maximum and blow at 40 mph the whole time. I then played it again in mid-March, when it was 55 degrees and a relatively calm day. The latter day may have been the most ideal weather I played in during my entire trip. However, the first round was still damn fun. Sure, I did not even play close to my best. However, I had a lot of fun trying to hit different shots in the wind and judge the bounces off the semi-frozen turf. It was great, great fun, and I probably enjoyed the course more the first time than I did the second.
I think people automatically think that because Sandwich is an Open Rota course, it is simply a tough, straightforward test. This impression is hard to get out of one's head when playing it. Yet there is PLENTY of quirk out there to keep the most ardent GCA enthusiasts satisfied. How about the 4th? The blind approach to the 5th and the tee shot at the 7th? The hidden green at the 8th? The halfpipe green at the 9th? The funky 13th green and the Suez Canal? The 17th fairway? There are plenty of holes out there that are highly unique and out of the ordinary.
Sandwich is a great pick when down in the area, no matter what the weather. It's tons of fun, as long as you accept that you will shoot a slightly higher score than at other links on the South Coast.
Of course, if you had to pick a course in Kent or Sussex to join as a member, why wouldn't you choose Royal Cinque Ports?