I jumped into double edge razors pretty quick and now have four in my possession. Quickly realized that going back and forth comparing and contrasting the different razors (sometimes mid-shave) isn't very helpful. So I need to chill-out, slow down, and really figure out what I'm doing using just one razor and one blade. My blade will be Astra Superior Platinum and I'm looking for advice on the razor. I have a pre-war Gillette Tech, a Merkur 41c, a Gillette old type, and a Fatip Piccolo MkII. Given this selection, what would you choose as the one razor to give your double edge safety razor student......your protege.....your padawan.....as their tool to learn with and why? Please no suggestions of other razors, even though you may think there are better out there to learn with. This is what I have.