Double Edge Razors

For me, the Blackbird is almost always to aggressive. If I throw a high-use blade into it, maybe 60 uses, then it has more of a chance.

But my rationale has always been that blade choice matters more at the edges of the razor spectrum. A razor at the edge of my aggression tolerance might work okay with just one or a few blades, but not work well with most.

And that applies on the other end as well. My Feather AS-D2 or 68 gap Game Changer have just one or two blades that work well in them, where most just don't cut well, due to the mild nature of the razors.

However, since most razors fall between those aggression types, with them, blade choice matters less, because the variations in blades is still within an acceptable range.