I thought I wrote on this thread.........
Anyways, it depends on the Godzilla. Full Powered GFW Godzilla has a very damn good shot of taking Superman out. So he wins maybe 7/10.
Meltdown is iffy. If he dies, then Supes dies. I know Superman has freeze breath, but it won't work. So he might win as well.
GMK may win as well.
PIS Marvel Godzilla kicks his ass. Regular Marvel Godzilla gets wupped.
2000 had amazing regeneration. Very high end. Got holes blown straight through him and came right back. But, if Supes hits JUST enough, he may be able to win.
Heisie was a total beast. Weaker version of Meltdown. Pretty sure he wins.
The other Godzillas will probably lose.
Supes is tough. In the Toho world, it would take high end fighters to battle the sun walking superhero(Spacegodzilla, Destroyah, GFW Godzilla, Grand Ghidorah, Kaizer Ghidorah, Mechagodzilla, ect.).
While it looks kinda pansyish it's actually reasonably strong , able to fire out rainbow hued beams that can cut through buildings with ease , conjure hurricane strength winds simply by flapping his winds and his spores can have several different affects. Not only that but he's magical !