I have many of each model, and I would agree that the 6x is brighter, but the clarity in both is very, very good. I would also take the 6x for a dedicated hunting rig, and the 10x every time for target use or for a dedicated open-country rifle.
The 10s I had still have one I bought over 10 years ago. My fixed 6 is 3 years. I wonder if glass on the newer 10s is better than the older ones? I might have to try another 10. Could be my eyes or I picked the wrong run of 10s to buy from
Trystan