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Interesting question, which for me has no one answer. For me, I have "great" eyepieces in particular telescopes, though looked at in general, most people would laugh at my choices which I arrived at by trial and error.
For example, in my C8 SCT, my favourite eyepiece is still a no-name brand 20mm Erfle I bought from Pocono Mountain Optics decades ago. Yes, there were better wide angle eyepieces around even back then, but finding very faint galaxies and planetary nebulas always seemed effortless with this eyepiece.
I have a relatively small, ultra wide angle 16mm Widescan eyepiece whose performance varies from sub average to abysmal in all bar one of my telescopes. But in my 80mm ED f/6.3 refractor, it is magnificent for general viewing.
In my 14.5" dob - an old style big 9mm Nagler does all the work, and is plainly great in that dob. But I've hardly used it in other telescopes.
In my first telescope from 3 decades ago, a K-mart Focal 4.5" reflector, I stll get eyepopping images from a .965" 25mm Meade Modified Achromat eyepiece (unfortunately, images from the same eyepiece in 1.25" size, don't really cut it in other telescopes).
But I do have one eyepiece which I've consistently used across nearly all my telescopes over the years, and is still the one I reach for when I want highish power - and that's my old 5 element, 6.4mm Meade Superplossl. I've got more expensive long eyerelief eyepieces in the same range, and more expensive Meade high power Ultrawides, and orthoscopics, but despite its narrow eyerelief, I like that 6.4mm Meade best - it has a huge sweet spot.
Regards,
Renato
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