According to the old Marvel RPG system, Galactus has Class 1000 strength, the Hulk started at Unearthly (100) and could eventually work up to, in time, Shift Z strength (500). Physically, Id say Galactus is still stronger than WWH, and thats not even counting the virtually unlimited Power Cosmic he possesses as well (which is at Class 3000 level)
Its hard to say who will win. Maestro is a future insane version of Merged/Professor Hulk, with Banners genius level IQ and a base strength of 200tons. WWH has probably the same base level strength, with a more normal intelligence level (able to call on the Banner side of his mind) and gladiator fighting skills. I would give the edge to WWH because of his fighting skills. When Merged/Prof Hulk and Maestro fought, Maestro could predict Hulks fighting moves, as he was the future version of that exact Hulk. WWH is totally different proposition.
Its a stalemate or narrow win (after days of fighting) for WWH
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Both Maestro & WWH are above Class 100 (which just means they can lift more than 100 tons.) To put either of them at 200 tons is to vastly handicap them, though. I mean, an enraged Hulk was bracing 150 billion ton mountains on his back. And in Planet Hulk - while Hulk was still weakened, he was shifting and moving tectonic plates to hold the planet together. Those things also weigh billions, if not trillions of tons.
Both Maestro and WWH should be in the (virtually) incalcuable range.
I going by what I've read in as stated by Marvel, their creators. Others versions of the Hulk have been stated as having base levels of 70-100tons. Maestro has been referred too as being twice as strong as his younger self, Merged/Prof, who is 100ton at base. 200ton is an extremely high base level for someone who can quickly amp their strength anyway-its no handicap.