Some months ago, I got into vintage double-edge safety razors.
I am old enough to have started shaving with double-edge razors, though after about a year (maybe a bit less) I switched to the then-newly-introduced Gillette Trac II cartridge razors.
I shave both my face and my head, and going back to these vintage razors has me truly enjoying shaving, and even looking forward to it, as opposed to the chore that it felt like before.
Left to right: late 1960s Schick Krona (in the metal stand with brush), 1970 Gillette Super Adjustable (my favorite), 1973 Gillette Tech, 1956 Gillette Super Speed, and a current production Parker 55SL slant razor (my second favorite).
The Parker 55SL slant razor, as its name implies, holds the blade at a slant. It’s very efficient at removing hair:
I tend to use Russian-made blades (I’ve bought lots of them in bulk due to current world events), and I am getting beautiful, comfortable, irritation-free shaves that are far, far closer and longer-lasting than what cartridge razors were giving me. Using the Parker slant or the Gillette Super Adjustable on its highest setting, my skin feels glassy smooth.
I have 3 more vintage Gillette razors that are not pictured, plus 2 new-production razors on the way to me in the mail.
Some say that using double-edged safety razors instead of cartridges will save you money. I can’t say that’s true for me 
.