Higher end rod
I am not sure if the higher end rods will keep more line in the air.
For my single hand rods I only bought G Loomis and Sage. I never had a cheaper rod to compare them with. The Lommis were the old IMX Of which I still have the 10 ft 3 weight. The GLX was in the 10 ft 8 weight. For Sage I had the 10 ft 6 weight RPL . All of these were great casting rods. Arthritis mandated I quit using the single hand rods in anything over a 4 weight. So my son now has the 10-8 and I sold the 6100 on ebay.
I know the longer rod will keep more line in the air. I always preferred the 10 ft rods, because you are getting a longer stroke.
For me now other than the 3 weight, I will be using all Spey rods. They are much easier on the arthritis.