If there was a "perfect" bag it would have been invented. The big wheels are huge advantage for certain things, and "two" has it's merits, but spinners clearly have come to dominate the market for reasons that many continue to chose them and most have migrated to only offering four when they used to have two or both.
IMHO given my experience with bot two and spinners think of some adjustments which I could merge the features of several brands that strike my fancy, LOL
So luggage manufactures and startup dreamers you could see about nudging me to spring for something before my BR International Spinner wears out.