rv cover recommendations-gift for parents! help!

hi! i am buying parents a cover for their trailer for xmas, and i'm trying to do research, but I definitely need some direction. does anyone have any recommendations... it seems adco and camco are the two major ones I keep coming across... are these the best bets? I see about the same type of reviews for both... we live in northern Illinois so winters can get brutal but summers also hot. they would mostly only be using the cover in winter. it's a 34' travel trailer.
annnyyyy advice would be greatly appreciated!!! would like to stay in the $300 range, don't want to get something that is generic garbage, does that sound do able?

help!! please! thank you!!!