It would depend on how far off shore I was going -
A river or estuary where shore is <200 yards away, probably shorts and a synthetic shirt, PFD. Possibly thin neoprene hydroskins if I was going to get splashed by a kayak paddle.
If I’m in LIS and not crazy far off shore or conditions were not bad, the neoprene is the way to go. Ideally something like a 2/2 or 3/2. This is still insuffucient for survival, but will keep you alive in most situations
Only if I was getting towards RI and north would I consider a dry suit. Considering the air temps a drysuit is going to become a wetsuit very quickly. I would only use the drysuit if conditions were rough or I was doing a long crossing where rescue is a long ways off. Even then, for a drysuit to be effective at 50-55*, you’ll need medium weight insulation which will be miserable.
Thus, I think the wetsuit will provide the best combination of heat management and cold water protection assuming you’re not doing anything remote or in bomber conditions.