I've had both, and it's not clear to me that acrylic is superior in hot, windy weather. Is that internet lore, or maybe a quote from some ad? What characteristic of acrylic helps with that?
Vinyl is heavier but has an advantage in that it is not woven, so tree sap, bird poop and dirt don't get down into the weave. It can be cleaned with strong detergents or even solvents if needed. Nor does vinyl ever leak unless a physical hole or tear is made, and those can be easily repaired if it happens. Acrylic, on the other hand, is light weight and colorful but difficult to remove anything other than surface dirt. And since it is a woven fabric, it eventually requires waterproofing to be re-applied. Acrylic is also difficult to repair if something damages it, e.g. a rip or hole.