My 2 cents...
1. Great image quality in the scopes you use,
2. Comfortable for long periods of use,
3. Minimise the fiddling when changing from one eyepiece to another. That means a set of par focal eyepieces (refocusing is minimised), all the same barrel size (no adapter to swap) and roughly similar weight to avoid rebalancing the scope.
4. wider field is nice but should not be the most important factor in choosing eyepieces.
5. Cost ... Set yourself a budget (upper limit). Below that I don't care about cost.
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