Differential Heads

There are Double Edge razors that has two different sides, either different gaps or even different combs

I looked into starting a sub-collection of these and found that when I shaved with them, I generally used the more aggressive side. I feel that I also need to enjoy using my collection and that razors are tools that should be used for their intended purpose, so this became a bit of an annoyance because I felt that I was only using "half the razor".

It's a bit debabable if the Bohin and the Renox really belong here because their "Adjustablilty" causes them to be differential heads.
The other two that maybe should not be listed here are the Le Supreme and the Revelation - Why would someone design a gap adjustable razor with two different gaps, when all you have to do is dial it to suit!
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