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ericc,
There really isn't much to choose between these, both will be fine.
The real question is what's your eye pupil, in your typical seeing conditions and allowing for the fact that with the scope putting some light into your eye, the pupil won't be as wide as it could be in complete darkness. I would normally suggest a 5mm pupil is a fairly safe bet, 6 may be being optimistic. Hence I'd say the 24mm will be optimal if you are observing from suburbia, or the 28mm if you use a dark sky site.
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