From my experience it is the Above The Tie Titan H1. I haven't tried all if the stainless steels on the market but I find the ATT H1 to have a lot of blade exposure and I find it to be slightly tamer than the Muhle R41. I use my ATT H1 as an everyday razor and find that it's more forgiving than my Muhle R41. I haven't tried it but I hear the Tradere OC is pretty aggressive.
The newer iKon SB is a distant second from the ATT Titan with H1 baseplate. I like 'em both but the H1 is definitely too much for me as a daily. The M1 is more my speed.