Seems like I typically see 1/4in balls in rear hubs and 3/16 in the front.

I assume this is because the rear wheel sees more abuse and thus needs a heavier-duty bearing.

I got to wondering about these rear hubs I have that have a cup and cone, loose ball design and use ten 3/16 inch balls per side. Does the ball size alone tell me that they are an inferior design? Would you avoid the use of a rear hub w/ ten 3/16 inch balls per side?