The size of the of the speakers in a cab doesn't actually tell you anything about how the cab sounds: an Acme 210 cab will sound literally nothing at all like a Markbass 210 cab.
Do you have any particular cabs in mind?
Years ago you could hear the difference between 10's, 12's and 15's when they were all made basically the same or at least i could but those days are long over, the design of the speaker and the cab has a lot more to do with the way they sound than does the diameter nowadays. When i was a kid I collected speakers and could tell the difference all the way from a 4" speaker up to a 15, course i was hooking them up to my old radios and had no cabinet half the time, but the bigger the speaker the lower it would go and the bassier it sounded, the resonance of the speaker determined how deep they could go for one thing and the bigger it was the lower the resonance usually was. I went to a jam a few months ago and used an amp with all kind of bottom, I thought it was a 15 until I asked the owner of the amp and it was a 210 combo, now maybe the acoustics in the room had something to do with it but I was amazed at how deep the thing sounded.
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in 1976 I use two flat backs now, great sound. Now sure how we started talking about bottom though, a P bass has a lot of low mids also that give it presence which to me is just as important as bottom, but it is still very hard to get a bad sound out of a P bass.