There is a ton of information to be had here, most of it helpful; BUT, music being the subjective thing that it is, you need to factor in the personal preferences (weight, styles, ergonomics, etc.) of the responders. Both of those two keyboards will do an excellent job. All other things being equal, you need to choose the one that SOUNDS the best to you and that meets your musical needs (ie. the TYPE of music you'll be playing).
I wouldn't worry too much about the single mic input. From what you describe as it's intended use, you should definitely use a separate mixer/PA system. If you can find one, you may also want to check out a Roland BK9. It would (IMO) be competitive with the other two. Good luck on your search. BTW, a cute, talented female vocalist is much more important than which keyboard you use
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chas