It doesn't
From what i read before buying, it seemed cut throats give the best, followed by a straight razor e.g Merkur HD, then the Fusion?
Was the main reason i brought it lol
The Merkur isn't a straight razor, which is another name for a cutthroat. The Merkur is a single-blade safety razor (Gillette make multi-blade safety razors).
You will get the best shave with the straight/cutthroat razor, but only if it's really effing sharp, and you strop it. And you'll probably get a better shave with a Merkur, too, because it forces you to take more care (no swivel head), and you can afford to use a new blade far more often. I think a lot of it has to do with Merkur owners knowing
how to shave properly, and using top-quality shaving cream (which is far cheaper than cans of gel), whereas most people just whack on some crappy gel and whip a Gillette across their faces.
What the guy in the video doesn't do, which is also a good idea (at least if you have really tough stubble like me), is to hold the skin you're shaving taut with your other hand. That helps with an electric, too. Here's how to
shave with a cutthroat. Notice how he uses his free hand to hold the skin taut.
I usually spend 20 minutes shaving (my head, too), and over 30 minutes with the cutthroat.
Certainly, I have much fewer problems with razor rash and nicks with the Merkur, Geo Trumper cream and a shaving bowl and brush than I did with a Gillette.
If you don't want to spend more than five minutes shaving, though, you're probably better off with your multi-blade Gillette/Wilko Sword and can of gel.