Can someone please explain to me the difference between Offense Mods and Crit Dmg?

"Pyrefly;c-1222392" wrote:
No, no, no... you guys have it all wrong. The simplest explanation of the difference between crit damage and offense mods is this:
Farming Jawas to 5* level 65 G8 vs. farming First Order to 7* level 85 G9.
Which makes most people say "Crit Damage mods rule!"

I think the main problem is actually this:

Farming FOST and FOTP to 5* through Hard Nodes....