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In my opinion, an ortho EP is a touch sharper at the very centre of the field of view than a plossl EP, but then is less sharp almost immediately away from the centre. So I would recommend having one high magnification ortho for close double stars and if impressed with that, maybe less powerful ortho EPs for planets. Eye-relief is not a worry as once found and centred on your target (assuming that tracking is good), then one can move the eye away from the eyepiece and still see what was being viewed. (True anyway with small objects like double stars and planets.)
However, orthos and plossls rarely go head to head with the same focal lengths. The difference in viewing at the centre of each eyepiece may in the end not be as important, as having the right magnification for your task.
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