All other things equal aperture will win...
Having said that, the real question is which scope will you use most?
The best scope is the on ethat you use!
Is the difference in size a problem for you to handle?
Will that difference change how often you get the scope out?
If the answer to the above is that the bigger size will not impact how often you get it out then go for the apeture.
The eyepieces that you have will work nicely in the 12 inch...and you can always save for more in the future...
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