Might as well go: eenee meenee meinee mo..just because no 2 faces are alike including your dad or granddad..go with your gut and DON'T assume a blade is your favorite based on it's first use..make that choice on the 2nd or 3rd complete shave...UNLESS: It pulls or tugs..also go to YouTube and look for blade stropping...tames some blades harshness to make easier on your face
if you need some good videos go to YouTube and look for Mantic59. Great guy who has showed many of us including myself what our grandfathers used abd how.
If you really want to do some homework, take a look at this:
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I wouldn't try the 7am ones at all... out of a pack of 5 I had: 2 great blades, 2 horrendous ones and one "meh" - struck me as being *highly* variable. I binned the other 95.