What's the difference between Endeavor and Dabi's quirks? Endeavor and Dabi seem to have very similar quirks, with the exception that the flames Dabi generate are blue. Is there any other difference? Is one quirk stronger than the other in some way?
Both quirks essentially do the same thing, but blue flames (used by Dabi) are hotter and more fuel efficient than red flames (used by Endeavor) though Endeavor uses blue flame as special move while all of Dabi flames are blue.

Because blue flames burn oxygen more efficiently, Dabi can create big attacks with less effort than Endeavor.

In my opinion Dabi quirk is more stronger than Endeavor quirk.