Swept Away regulars loved Tower Isle.
We did the Couples Rendezvous for the first time and got Tower Isle but wanted Swept Away. We loved it! The only thing I would tell someone asking about the difference is the beach. If you are a big beach person then Swept is for you.
The only negatives that we have found at Couples properties is that the dive boats always seem to have issues (both places) and many dives are cancelled or rescheduled because of it. Also on both properties we found the breakfast service to be very slow. Slow as in no coffee or tea sometimes until breakfast is almost finished. This seems like it would be a very easy fix. Its not that big a deal to us but it was to some around it was.
The bottom line is we would go back to either in a heartbeat.