I'm not sure about this, but it seems like the type of razor could affect which angle of approach you should use.
I've read (and seems true in my opinion) that the blade in the Merkurs have more of a downwards angle, as the blade is bent more. The Gillettes, on the other hand, seem to have more of a flatter blade.
Due to the position of the blade in any razor, using angle 2, the edge of the blade would first touch your face in its most aggressive position (the space between the blade and safety bar is maximized, and the blade is at the most aggresive angle). With the Gillettes, angle 2 would put the blade at an almost perpendicular angle to your face, which could have bloody repercussions. With Merkurs, on the other hand, would be at more of an angle at first contact.
Granted, using angle 1 would be the best way to get a gentler blade angle first, then further adjust to change the aggressiveness. If you want to go the aggressive route first, though, the Merkurs might be slightly more forgiving.
Brush: Tweezerman Badger
Cream: KMF Cool Mint
Razor: Merkur 23C, 63 Slim Adjustable
Blades: Red Personnas, Merkur Platinum (waiting on my Derby order)
Aftershave: Earthscience Skin Soother, Nivea Sensitive Balm
"I choose to live and to
Lie, kill and give and to
Die, learn and love and to
Do what it takes to step through"