There is always a benefit with degreeign any camshaft. Sometimes it's only to verify that it's in the engine as it supposed to be. But many times due to variences in parts production and block machining it is not. So there is either peace of mind, or performance benefit every time.
The timing set comes into play if you degree it and there's an issue. Rather than buying offset woodruff keys, or offset bushings for the dowel and then drilling the timing gear you can just use the extra slots to adjust the cam timing. Personally I pretty much always use the Summit billet roller set with the extra keyways. Sometimes I need the extra slots, sometimes I only need a decent chain and gears. but if you're buying one anyway - buy a decent one that can do everything you might need it to.