Captain Omnipotent has powers so vast that he can only be described as being essentially omnipotent as well as omniscient and omnipresent. He knows when and where there is a crime being committed, and won't hesitate to destroy one or more galaxies to stop it; in fact, 95% of all stories involving him ends with him destroying a galaxy, or even the universe, and recreating it in the beginning of the next story. 
On a serious note destiny would win because the darkness itself is residing in alternate realities and dimensions. Combining the armies of darkness, the vex can make sure goku and his annoying friends parent were never born, killing them before anything happened. Cabal could just destroy their homeworld but not much else. Hive will pull their entire race out of the Erebus dimensions and adapt the darkness technology and turn the 2 against each other.
I need not continue
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	Time modifing by the vex really turned out well lol and u talk dimensions lmfao u have watched dbz ? Not likely based on your post
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	Also we don't know how time flow works in Destiny so we don't know if going back in time would affect their current battle whatsoever. Maybe it's works how it does in DBZ and they only affect an alternate timeline. That would then mean that a battle would never occur making their time travel pointless and a void argument. But we don't know so whatever.
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	Time travel does exist... you seriously never paid attention to the story of destiny at all. I am done talking with you.
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	Also by your logic that time travel wins you understand that DBZ characters have time travel capabilities too right?
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	Um what is your reading level? I didn't say time travel didn't exist I said we don't know how it works. There are plenty of theorys on time travel and the game never confirms any, it just states that it exists. I provided one that would nullify your arguement, but as I said it's not confirmed so it doesn't matter and your comment was pointless.
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	Technically, Xenoverse is canon, so they could just replay the past. ;)