In layman terms,
a) Efficiency
b) Bass
c) Cabinet size (refrigerator size vs WAF size)
Pick 2 (ab, bc or ac)
But, there's a whole lot more advanced topics tied to driver design, quality, compromises, etc....
Yummy quality power is very affordable these days, i.e., it isn't the 70s. Pursuit of efficiency and exclusion of "supposedly inefficient" ear candy speakers is a silly thing to do in 2024 and an unnecessary restriction/compromise imposed on the engineering workspace. One would be surprised how little power the "supposedly inefficient" ear candy speakers actually use at deafness inducing spl levels.