As a rule, fixed power eyepieces will offer better clarity than zoom eyepieces.
I havent looked looked through all of them, and most scope makers today only offer them, no other choices.
Except Kowa, who still offers fixed power.
In Pa the vast majority of all long range hunters use twin spotters mounted in adjustable brackets for hunting.
Hours are spent arguing over and comparing optics even more so than guns.
It is an absolute fact that a scope quality can be improved by changing the eyepiece.
Even if that means using one not intended for the scope by adapting it.
In Pa the most popular scopes still in use today by L/R hunters is the old 60 mm Bushnell Spacemaster.
But many wont have original factory eyepieces.
I have at least ten friends owning twin 80 mm Swarovskis. Do they kill more deer than they did while using their old Bushnells? Well actually not really for the most part.
It is also a fact that no scope can make better conditions from poor ones, and that explains a lot.