I look at my hands, I think that's the easiest and it's such a common thing to do you probably have a better chance of doing it in a dream than any of the other techniques.

But after reading and developing dream recall I'm starting to believe a physical reality check isn't good enough, and you should start working more on just general awareness. What if you're dreaming in third person, or don't have hands in the dream, or if your RC fails? You should try to be able to fall back on your ability to just survey the surroundings and be like, "hmm, winged purple elephants aren't actually real, I think I'm dreaming".