Let me see.
Garou is 500 Pettatons, while Tony is 370 Pettatons (To be more especific), no quite a big gap, it can be easily closed with Iron Man's own stats amp, as he can just simply absorp/sinphon energy from his surrounding to amp himself.
About powers:
-He's precog is literally the worst, it does not allow any sort of future vision aside from body's movement, which is useless agaisnt someone like Tony who does not rely a lot in physical combat, in addition that Garou would not know what kind of powers Tony has until he get hit by them. Heck, Tony can actually do the same thing with his computer (Which can do a lot much more), he has recorded Cap America movements, he can use it to easily counter Garou fighting style. Same with power mimicry.
-He's adaptability/RE is more akin to Reactive Power Level, which will only increase it stats to adapt others fighting style, and that is only if he take lot of damage and will cost him he's speed. And again, is not useful against someone who does not have an actual fighting style, and I doutb that it would allow him to adapt against things such as illusions, invinsibility or heat-energy draining.
-He's attack that can deflect projectiles are not going to do a shit, even if they are reflected with the twice of power, Tony will just simply absorp them back and amp himself. It can't also reflect attacks that are not projectiles such as electric, sound and omnidimentional attacks.
-Rage power is one of Tony specialties, it can help him to easily outsmart his opponents when they become mindless monsters. This is also countered by Tony's own stats amp.
-Regen could be problematic, but the armor can also self repair.
-He has planetary range in this form, I will assume is via shockwaves, this is easily countered by Forcefields, kinetic energy absorption and Iron's own repulsors.
I will later make a argument for Tony, anyone wants to debate something?