Mr Marvel
The Might of the Infinite
Never did I state that Thanos was Wiser than Odin, in fact I said Odin was wiser, However I did say that Thanos is MORE Clever, Manipulative and Intelligent, hence why he always wins prep battles.
By some peoples' Logic Odin would be as strong w/in Dormmamu's Dark Dimension as he is in Asgard. Which doesn't make sense seeing as All Sky-fathers/dimensional lords are more powerful w/in their native dimension.
The point is Thanos is Neutral (No Dimensional Boost), therefore he's used to fighting against Stronger opponents, is Odin.
Also keep in Mind that Thanos has had a power boost since their battle, so he's stronger whereas Odin is Less Powerful outside of Asgard. Do you see my point here.
Another good point is that After Galactus got knock thru his ship he is noticeably angry by this, meaning that he was trying very hard to destroy Thanos, which is why he is surprised by the shield's strength when he attacked.
To understand his Anger you have to take into consideration Galactus's personality, he's supremely Arrogant w/ this Holy-er(spelling)-than-Thou attitude so image his reaction to having what he'd basically consider an insect to get the upperhand on him, that would be infuriating. And would require swift Vengence on his part. Imagine losing to a 5yr old at something your good at.