The size of the gear you use is dependant on a few factors
Starting with the biggest, 10 frame, full depth, OK for young BK's, less boxes and frames per kg/pound on honey harvested.
Next, 8 frame full depth, good for most, but as I get late into my 6th decade, a super full of honey is getting heavy.
Medium or WSP in OZ, 8 frame is the most usable no matter what age you are.
Ideals to me are just a pain, relatively expensive for boxes and frames, alot of handling in boxes and frames for your honey.
Commercially, having mixes of sizes is hard to deal with, transport, harvesting.