Maybe that third one is a mulching blade?
I have a Gillette Sensor III. I can't believe how expensive the replacement blades are.
I also have one of the old style standard single blade razors. I find that it's all in the type of shaving cream/gel one uses in preparing/softening up the beard/whiskers for shaving. Everyone's beard/facial hair is different. But when I find that I do that, even the old style works just fine for me.
I use Edge gel. Stuff like Barbasol is terrrible.
I went to shave yesterday and found out my daughter had used the last of my gel to shave her legs. AAARRRRRGG! In the case of an emergency, I had to use hot water and soap.