He'd lose to both.
Mayweather doesn't want anything to do with Ward, and GGG is not ready yet.
GGG will avoid ward, and if he didn't Ward will end his hype train easily. Mayweather isn't gonna fight GGG he's not a big enough draw.
GGG would be drained at 154lbs and he wouldn't be as strong at supermiddleweight.
I'd rather he stay at 160lbs and clean out the division by defeating Martinez, Quillins and Murray
Mayweather of course, but IMO, Mayweather would avoid this challenge and opt for some easier prey.
None of the above. He has not yet cleaned up the middleweights which is not a given.
....see GGG go up and fight Andre Ward or go down and fight Mayweather?