I'm not going into PRS vs Gibson debate. As I said before both are great guitars. PRS is pretty consistent and sometimes Gibson isn't. But I don't know about your SG. Here are my opinions: both are lightweight, which is a plus. Both have uninspiring pickups; I'd replace them with Duncans (with stock pickups, SG sounds meaner to me). Tonewood matters but for electric guitars it's not as significant as the electronic parts and the rest of the rig. Personally I'm not fussy about different guitar construction/features (bolt-on or set-neck, scales, neck profiles etc). To me what's left as decision factor is neck pickup position...