Please read the forum guidelines before making any more threads.
For this thread alone, you'd have to define what a "hero" is, "in terms of fighting" how? (H2H skills, overall power, strength, intelligence, prep or no prep, etc.).
Then you'd need to focus it a bit more, because if 10 people posted their lists, not one would agree on anything because it's too broad a topic.
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If you really need to know a few "high-end" heroes, Dr. Strange, Silver Surfer, Thor, Superman, Mr. Majestic, Reality-warpers like Franklin Richards or The Doctor, Jenny Quantum, various veteran Green Lanterns, etc. would all be somwhere on the list.
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Closing now.