I am planning to purchase a pair of RM Williams Craftsman in chesnut. My only problem is I am unsure of which style to purchase(Comfort Craftsman or Craftsman w/leather sole). How much grip does the non slip on the comfort give compared to the leather sole. Also Does the microfibre insole on the comfort's make much of a difference. I am drawn to the leather sole but I keep thinking the non slip would be the more practical option .Any info would be appreciated.