Okay i know this is about old and overused topic here on Comic Vine but a fun argument and i think it will go on forever. When you argue that the most powerful Heroes in both dc comic and marvel are fighting we always forget one thing the world around them. I am going to go over statistics here. Lets say that they sentry has the power of only 1 exploding sun(our sun) then would conclude that his hits would generate as same as 10 octillion (1028 zeroes on that numer) megatons of tnt. Most nuclear weapons are measured in megatons and the largest on we ever tested was the tzar which was 100 megatons and the explosive radius was 35 km radius. Think of that power 0.1 octillion times stronger. dont forget that our sun is fairly small compared to must suns in the world.
Just think if Sentry had 1.000.000 exploding suns inside him and superman similar to that then the power they generate if they use all their powers in one punch, kick or just fly into each would vaporize everything in 3.500.000 octillion kilometers in radius. This is because if the power cant go forward then it will go into all other directions. My opinion is that that would never fight due to the destructive nature they would make, i think even void would not play around with such power. If Uncle Ben would give superman and sentry an advice it would be "Man oh man that responsibilty and power thing i talk about... well i feel sorry for your backs having such a burden". I think the only loser in this fight is the world.