Originally Posted by Reference_head
I wouldn't go with the driver size but the speaker size and type would matter.
I suggest comparing driver areas (primarily in the bass) because they describe both the fundamental output versus the distortion of the speaker and the internal air volume of the system they're in within those characteristics. The woofer(s) will determine the foundation that the rest of the system - all its midranges and treble drivers - are just added to.
To use another automotive analogy, setting aside power adders like airchargers an engine's displacement is more informative about its power profile than are fuel or ignition systems. The analogy is imperfect but cylinder number and layout might be to the engine what driver type and arrangement are to the speaker: Important but not in as fundamental a way as displacement.
It's this foundational system that the laws of physics tell us describe what the speaker system will do for us. Will it play to 30Hz, will it play loudly, will it be relatively efficient or inefficient, and what will its approximate distortion be.
To a shopper price is at least as important and to many shoppers initially it'll be most important. It must be factored. But try identifying the best acoustical class before you shop price and you'll find that the field narrows and that your checkbook will start finding the differences between the candidates on your list more different in terms of intangibles than real, fundamental acoustical personalities.