I have fished a Scott G series and definitely classify it as a true medium action rod. I was on a trip out west and the guide let me use his G 4wt for fishing tricos; great rod for that. I own a Scott ASA, the original in the A series. I have also fished the A3, and will say the A series are med/fast rods and are great all around rods. I use mine for fishing tricos, midges, nymphs or streamers. its a workhorse. I have a Scott S4 which has an action close to the Sage 1, which is a fast action. Now this rod is more specialized, bombing out big casts, heavy nymphing and big streamer fishing.

Figure out what you want to use the rod for and what the main objective Is and buy the rod that best fits that use.