Namaste

I am confused with verse 10 in Bhagavad Gita chapter I.
Until now I knew this version

This army of ours marshalled by Bhishma is insufficient,
whereas their army marshalled by Bhima is sufficient.

Now I found the verse turned around

This our army defended by Bhishma (is) impossible to be counted,
but that army of theirs, defended by Bhima (is) easy to number.

Duryodhana had 11 akshauhini, Pandavas had 7 thus I would favor the second version.

Why are there two versions? Or do I misunderstand something?

Thanks - Pranam