i am confused about which style of belt to purchase for my ariens 10-28 rider mower . amazon lists two belts with the proper part number for my machine.one is a stens oem belt and is 30 dollars.the other belt is also a stens but is described as a raw edge belt.this belt is 42 dollars.i have never heard of a raw edge belt.i am very concerned abut slippage.i would appreciate any opinions about which belt would best serve me.money difference does not matter.thx.