I found a deal where I can get a case of Wilson US Open Regular Duty tennis ball for $2.83 a can while I can get Penn Championship Extra Duty tennis balls for $2.00 a can. I know that Wilson US open tennis balls are better than penn championship balls. However, the balls would be used on hard courts which is why I am hesitant to buy the Wilson US open regular duty tennis balls even though they are a great deal. I play on a college team so the balls are going to be hit pretty hard and I want them to last as long as possible. So would the US Open regular duty tennis balls still last longer than the Penn championship XD balls on hard courts? Or would it be a waste for the extra 80 cents a can to get RD balls for hard courts? Any insight would help! Thank you!