It's debatable.
They have the exact same overall rating in singles matches and one of Omega's opponents (his lowest rated singles match) was Jay Lethal who had to sell a kayfabe injury for the whole thing whereas Okada's highest rated non Omega mach was against the glorious Shibata. Granted Okada also got Fale so that's a wee bit of a wash. But then again Okada got to craft a main event match with Fale wheras Omega had to do a shorter semi final tourney style match with Lethal.
They are both at an exact average of 5* in singles matches.... and actually Omega could actually technically pass Okada for a bit once you factor in Okada's Yano match and Omega's Suzuki... actually ironically the tie breaker at the end of G1 could end up being who had the better match with Yano LMAO.
Omega had 2 near 5 star and one near 4 star match in the span of two nights...
So really it's a tie and I'd give Omega the tie break
Okada got Ibushi, Suzuki and Shiabata, Fale, Cody.... Kenny got Elgin, Ishii (x3), and Lethal