I've shot both and for competition I prefer the 4 weight SCS. The 5 weight actually has more buffering potential beyond just the weights as the slide is made out of steel vs the aluminum of the 4 weight slide. The 5 weight actually felt softer to me but the dot moved way more and my double taps were usually alpha charlie instead of two alpha with the 4 weight at the same distance. If I was shooting recreationally, had a higher caliber gun like 40 or 45, or had a bolt that needed the weight removed to be compatible with a SCS I would run the 5 weight.