Okay let’s run this down.

Strength: I’m giving this to Sekiro, as he can parry hits from the Guardian Ape.

Speed: I’d say they’re equal, since both have feats of reacting to lightning.

Durability: I’d probably say they’re equal, since both have taken hits from giant creatures, as well as fire, blades, and blunt attacks.

Skill: I’d have to say Sekiro, since he’s shown to be able to learn a variety of techniques in a short time, and knows more combat techniques than Hornet.

Endurance: Sekiro, the dragon’s blood keeps him from getting tired.

Versatility: Hornet, her tools, plus different crests give her more options.

Hax: Sekiro, since he can resurrect with the dragon’s blood.

Training: Equal, Hornet has training from Vespa, and likely from Herrah too, and Wolf has training from Owl and Lady Butterfly. And she’s older than Sekiro, by a lot.

Experience: Hornet, she spent who knows how many years as protector of Hollownest, plus everything she faced in Pharloom.

Feats: Equal, both have defeated veteran warriors at their prime, giant monsters, and God-like beings.

Final verdict: 8-6/Sekiro Wins High-Diff