Strida is actually a pretty. . . .
good folder. Definitely overpriced, especially for a single-speed. But I have sat on one in the store and it is very solid. It has a belt drive so no need for any greasy chain or lube on the boat. For that mile or two between the boat and the store it would be fine. But not at that price.
Any bike you choose should be all alloy, no steel anywhere. That is the $100. difference between the two West Marine offerings. Even the aluminum alloys will corrode but steel will be rust in less than a year.
I wish my good road bikes folded up, be great for getting some exercise while seeing the countryside. Having raced for many years it is hard to just putter around on a little folder. And no, I do not do mud. I am old but once a roadie always a roadie.