Right side of face - Dorco Pace 3 (3 shaves)
Left side of face - Gillette Mach 3 (1)
Very close to a tie and in Dorco Pace 3 favor. I got some nicks on the Gillette side.
Have you tried the Personna Caliber 3 yet? I like the Caliber but haven't shaved with a M3 in years so not sure how they actually compare head-to-head nor have I ever shaved with a Dorco so I have no frame of reference for that. If you ever get a Caliber please post your comparison to the Dorco and M3.