Size of future bingo cards?

I made this month’s card 3x4 because I figured 12 for a blackout was reasonable enough to be doable while still being challenging. But I’ve gotten a few comments that bingo cards should have equal columns and rows. So I want to know, what should we do in future months’ cards? 3x4, 3x3, or 4x4? Or are you guys super ambitious and want to do 5x5 (25 for a blackout)? If you have an alternative idea for an ideal card size, let me know in the comments!

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