Victory is not slow at all...
G Gundam and Master Gundam are... very fast too
VFs do fly faster but Gundams have stronger and better weapons (for example: psychic communcation weapon)
That's why in SRW, VFs (and Aura Battler Dunbine) are for fast attack and getting the enemies attentions while Gundams and other Super Robots do the finishing move. (except Amuro, he can do anything with his Hi-Nu Gundam)
Both the Victory Gundam and Master Gundam are outclassed even by just the VF-1, to say nothing about the later, more advanced Valkyries. As for the psycommu weapon, I assume you're now moving from mobile suits and talking about Angel Halo. THe Macross would make short work of that thing, well outside of range of course.
As for Amuro being a god, I'll reserve a good laugh for that one