> Does Overwatch have a bigger cheating problem?
Yes, considerably.
One can also look at Counterstrike running on Valve's matchmaking which uses userland cheat detection versus Faceit's kernel level anticheats for the exact same game. It's been incredibly rare for me to run into obvious cheaters on Faceit but I'll often run into cheaters in Valve's matchmaking. It's the same game, the same executables.
I finally stopped playing Counterstrike because of all the cheating. It was difficult enough to detect that I never knew when I got killed because someone was good, because they were lucky, or because they were cheating.