Personally, I prefer the rectangular mainly because of my height (I'm 5'5") and current lifestyle. It sits nicely on my hip when I wear it crossbody. However, with the square, it sits around my waist (due to the shorter chain), which is kind of awkward for me. It's the perfect length if I wear it on my shoulder.
I think the square mini is REALLY cute, but it's just not practical for me right now (I need a crossbody bag when dealing with a toddler [emoji28]).
Good luck with your decision! [emoji4]
Thanks for the input! I'm actually in the same boat - I have a toddler and an infant. I actually just tried on the square (just showed up on my doorstep) and you're right. It doesn't work so great as a crossbody which is what I need. Guess I'll be waiting for he rectangle. [emoji6]