In an entirely different climate, we also prefer Sunbrella. Have also made some covers out of Shelter-Rite®. It is great for DIY, in that you use HH66 vinyl glue. It will not deform and is totally water tight. You could build an inflatable boat out of the material. However, as a shade or open shelter it is fine. I would not use it as a total cover, unless you had very good ventilation. It is also heavy.
The 25 cover will be heavier than the 22 using Sunbrella, but it its light enough that two people can easily handle it. I was able to put the cover on my 22 by myself. I have a cover for the 25, but we have not used it yet. I think it will be easier with two of us--but I probably could do it alone (considering my age and disability).