Welcome to our forum.
You are asking a question that is impossible to answer. Price is really just one area of your decision here. I would agree that you should get in and try them for fit. You are looking at two very popular and well built tubs. I cant remember, but is the caymen the same as the optima but with a lounger??? compare your options and needs and you will be able to answer that question. I dont think that you would go wrong with either one.
I edited my post
go to the spa stores and sit in each of them....even without water, you may find out if one's got seating that's uncomfortable for you...some seats are confining, too shallow, too deep....and be sure that the footwell is roomy enough for however many people you plan to have in the tub....You may find on your own that the price isn't the deciding factor, but the comfort level for your posterior.Best of luck!