I found it really hard to picture the different brands sizing so wanted to share this from my beginners stash.
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From top to bottom are Booroi small and large, Bumboo small and Iishfly large.

All are brand new/not yet prewashed so I'm not sure if they'll shrink differently.

To me the bumboo and large booroi are about the same size although bumboo is wider where booroi is taller if that makes sense.

Still a few weeks (hopefully) before I have a baby to test them on but hopefully that helps anyone in a similar position to me. Both Iishfly and Booroi seem to have been discontinued but there are still a few floating around.