In certain aspects, it is better to be average, like foot size
In certain respects,it is better to be average,like foot size
In certain aspects, it is better to be average, like foot size
In certain respects,it is better to be average,like foot size
In the cited context, some is far more common than certain. But I'd say aspects is just plain wrong...
The relevant meaning of aspect as used here is this OED definition...
aspect
One of the ways in which things may be looked at or contemplated, or in which they present themselves to the mind; a phase.
...which in the cited context is equivalent to perspective (the more common term today). Note that both of these terms normally take the preposition [looked at] from [some aspects / perspectives / viewpoints / angles]