You're dealing with apples and oranges here: Roto-mold spas and acrylic are not very comparable. I am a dealer who sells both types of spas so I have no agenda other than to point out that (generally speaking) these two tub styles are bringing two different things to the table and should not be compared straight up, per se.
Roto-mold focuses on lower cost and being fairly simple and easy. There are pros and cons to that. Acrylic can be simple and easy and low cost but you tend to get more out of them in terms of jets, motor/motor size, features, options, etc. from acrylic spas. Additionally: Most Roto-molds are 110v while most acrylics are 220v.
Again- I am speaking in very broad and general terms here, as there are 110v acrylic units and you can always convert a 110v to 220v when looking at Roto-molds.
Thus: When trying to distinguish between Roto vs Acrylic, look at the *why* they different and see if there is something that stands out in the plus or minus column. If that eliminates one type over the other, then you have your answer.
I hope this helps. I really didn't dive into the nuts and bolts of the specific brands as I prefer for you to determine first if you want roto or acrylic. I'll leave it to others to discuss the virtues of each product you've mentioned, as I do not sell any of those particular manufacturer's products.
Good luck moving forward.