Generally Team Good wins, since staying on Team Evil requires you to aspire to such a level of internal backstabbing as to thwart any and all efforts at cohesive action. Chaotic Good guys aren't in the middle of an unending bloody war against Lawful Good guys.
What you call "unending bloody war", team evil calls "mutual benefit agreement".
You know how team Lawfull Evil came to being? There needed to be someone to fight the hordes of the abyss. But fighting the hordes of the abyss isn't pretty. And foolish mortals were always doing stuff that further fueled the chaotic evil. The deities of good needed someone to do the dirty work of fighting the endless demon hordes and punishing mortals so they wouldn't do stuff like open sealed portals.
Asmodeus was that man. He promised to fight CE for all eternity.
In return, his personal inviolable plain where no good deity can touch him and all the LE souls he can corrupt.
So what if they have to kill some demons now and then? There's endless of them! And devils do need training for building up your armageddon army.
Thus, there's no backstabbing at all. There's culling of the weak and war training of both evil sides, while LE enjoys from complete diplomatic immunity from heavens.
All the while the forces of good get softer and softer. Or corrupted. Celestials fall every day. How many infernals you know that suddenly repent and become do-gooders?