One blade only? It'd have to be a PSI or Feather.
Israeli Personnas in a Feather Popular or Gillette Knack. Amazingly comfortable shaves, three passes?, no problem!
I'm be trying to find what everyone thinks is their best blade so I can make a decision but I have quickly realized that each blade reacts differently to each person. I have been wetshaving for about 3 weeks and have been using Sharks. Not too bad of a shave but found I had to go over certain areas several times. Today I switched to the notorious Feather and absolutely hated it. No weepers at all but tons of razor burn. Tomorrow I will try Astras. I guess I'll keep changing blades until I find one that suites me. I also have Blue Birds, Lords and Gillette Silver Blue in my inventory which I'll try each for the next few days. Failing that, I may purchase a sample pack or perhaps use the B&B Blade Exchange if it's still active.
Gillette 7 o clock permasharp stainless. (Indian green).