Since starting DE shaving about three years ago, I have had the opportunity to use several different razors - Merkur HD, Progress, Slant, Gillette Tech, SuperSpeed, SA, Slim, Fatboy, and Aristocrat, and I can't tell for the life of me when one will be more aggressive than another - I have to use the razor to figure it out.
I know that blade gap is a large contributor, but how big a part do blade angle, head weight, and other factors play?
If you had to quantify the contribution to overall aggression, how would you do it? I think that my personal scale would look something like this:
Blade gap: 70%
Blade Angle: 20%
Head mass: 5%
Unknown, x factor: 5%
What do you think?