Size does matter if only because you have a trade-off in speakers between 1)(small)Size, 2)effeciency and 3)bass. Mother nature will not let us have all three. If you go for small size you will give up one of the other two(at least). Smaller is likely to be less effecient and put a different load on your amp. Not better or worse, just different.
I remain,
I remain,