Even tho I am a huge Star Trek fan (especially of the Borg in particular), Oryx and his Taken win this. While the Borg's ability to adapt would work against a race that uses physical laws like the Fallen and Cabal. Taken run on literal space magic and use a completely different set of rules. The closest we have seen something similar to the Borg going against the Taken was in the Book of Sorrows when The Vex launched an assault on Oryx throne world aboard the Dreadnaught. Even with them replicating the Hive magic and the ability to plan for nearly every possible out come via time travel, they [i]still[/i] were taken by Oryx like it was nothing. The only known thing that cannot be taken by Oryx are beings directly created by the traveler (guardians), I hate to say it but until I see/read about a race that can go against this without the Traveler, I'm inclined to believe any race without some form of space magic could effectively go against Oryx.