You might find people that have a personal preference for either but they are pretty much the same. For such a short flight I don't see how one is better than the other.
I would take the one with the schedule fitting best your needs.
Flybe go tot he city airport and EZY to the international one 45 minutes outside Belfast by bus so much easier if you are visiting Belfast City. Really for such a short flight the quality of the airline matters little and there is not much between them anyways.
The schedule is similar and the closeness to Belfast does not matter as i need to get to mid ulster.
All other things being equal, I would fly in and out of Aldergrove, given that it is a nice easy run from your home. Also, Easyjet are a good airline to fly with on these short domestic routes.
So it would be Easyjet out of Antrim for me, if I were in your position.
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