It is hard to say which is the more important FOV or ER. Without appearing to make a silly comment I would have to say "both"! I used to use a set of Celestron mid range plossls, but now I only use the Pentax and Stratus eyepieces.
The eye relief will make it much easier to see something, especially if you need glasses (or if anyone looking through needs them). Also people who are not used to scopes will find longer relief much easier, this is particularly handy if you are showing objects to small kids or their mums and dads.
Field of view will be very handy on scopes that do not track as the object will remain in view for longer so you won't have to keep moving as often, this would be very handy if you are showing other people and need to keep it in view for a while. With a focal length of 8 to 10 the objects will move fairly quickly.
I actually bought my Stratus 8 "for the public" to get FOV and ER but it cost around $200 as I recall. If you happen to be in "the same place" as me some time, borrow it for a look.
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