I came to a realization in the last few months when discussing RCs online. I've always personally used nose pinch as my #1 go-to RC, and could count its advantages over just about every other RC:

+ it's fast: nothing to find, your hand and nose are always "right there" in the dream, just one quick inhale and/or exhale and there's your answer
+ results are *usually* always clear and unambiguous (unless you have nasal congestion)
+ you can do it in the dark/void (this has helped me on numerous occasions)

(In this discussion I'm not addressing problems like not giving enough attention to your RCs, or ignoring the results of them -- a 100% perfect RC could still fail due to these "user errors.")

Everyone has their favorite RC, and that's fine, what's really most important is that your RCs work *for you*.

But here is my reasoning as to why Nose Pinch is best: it is unique among RCs in that it avoids expectation problems by having one foot solidly in the physical world.

When you do a nose pinch in dreams and take a voluntary breath, you are using your physical body's diaphragm (which is the only unparalyzed large (semi)voluntary muscle in REM atonia). Your physical body's airways will not of course be blocked by your dream hand plugging your dream nose. And this is something I've always noticed about nose pinch in LDs: more than just the fact that I can breath through the "pinched nose," it is that I have a distinct impression that my breathing apparatus/airway is not connected to my dream nose.

All other RCs that involve inspecting or interacting solely within the dream world suffer the problem that your dreaming mind alone produces the result: hands can look like waking hands, you may be able to read text (or think you can!), light switches may work fine, gravity may feel like waking gravity and behave as such, and so on. But with nose pinch, the inhale/exhale take place in the physical world, not the dream world, and so your subconscious is not free to "troll" you with waking-like results.

So there's my case. I think it's interesting, and don't recall reading that in any other literature before.