A very nice question to think about. For most people it’s theoretical as they will have more than one.
But I think this link to an old article gives an interesting perspective, and one that makes sense to me...
https://stargazerslounge.com/topic/2...he-exit-pupil/
With your scope and moderate light pollution and assuming average seeing, I’d aim for the best EP that gives you a 2-3mm exit pupil. Assuming your 10in (250mm) GSO is f5, yielding a focal length of 1250. A 10-15mm ep will result in a nice and satisfyingly comfortable exit pupil and give an all night, every night usable magnification of about x100-125.
The cost/quality/aFOV is then down to you.
Happy decision making.
Hemi