A battle of Cosmic Heroes. From two universes If anyone ask the Phoenix is included she a cosmic being. Basically space heroes vs space heroes
It says SPACE HEROES, not all cosmic beings battle.
Not sure who'd win.
Here's a list of Marvel cosmic heroes and heroines:
Warlock, Silver Surfer, Firelord, Nova, Thor, Drax, Moondragon, Gamora, Dr Strange, Beta Ray Bill, Gladiator, Hyperion, Phoenix (Jean Grey is a heroine), Jack Of Hearts, Binary, Sersi, Thena, Eros, etc.
DC's list:
Wonder Woman, Martian Manhunter, Superman, Captain Marvel, GL, GL Corp., Spectre, Fate...
That's all I know for DC.
Please feel free to add to either list.