Satele with ease. She and her master were fighting a competent (albeit losing battle) against Sith lord Vindican and his apprentice Malgus. Meanwhile Kylo fought a janitor storm trooper Finn and an untrained force sensative Rey, while losing to that latter.
"BUT KYLO WAS SHOT!"
Yes he was, and he was also seen striking his own wound drawing strength from it as Sith do sooooooo, not really an excuse for such a poor showing against untrained individuals.
Satele takes this handily.