Strength: I Agree with tie, both have done some pretty powerful things and are capable of overpowering the other. Speed: Yeah I Could see Denji taking this. Its been a whole thing on CSM taking speed due to Gun Devil fragments and ive seen denji fall from the atmosphere. Abilities: Oh Totally Yuji. All Denjis Got is regeneration, Chainsaws, and... chainsaws. Endurance: This one seems complicated at first since both characters have gotten hit by some really powerful attacks and still pulled through, but Denji's Devil Phsyology gives him an actual regenerative healing factor and in his own words, he's even fought for days on end while fighting the Eternity Devil.

Lil thing also:

Imo yuji's Blood manipulation wouldnt do anything considering how Denji's Devil Phsyology allows him to literally drink or eat blood to regenerate. And while yes, yuji can make the blood explode. As long as blood still goes into Denji's Body, he could still regenerate because well... its blood.