To be honest, I think what method you use (or even multiple methods) depends on the person. I think you should just keep experiementing, preferably with 1 per night before you find one that works. Once you find a method that works for you, you can always try tinkering with it to make it better.

I assume you're talking about WILD methods btw. If so, keep in mind that you don't really need to reach the dream to know what works for you. Just reaching SP is enough. Once that happens, the next step into the dream is easy once you learn to keep yourself calm through SP

I also don't really believe that it matters if you switch between methods since all that really matters is you're keeping your mind conscious into sleep. So doing whatever to keep your mind occupied is enough.

I know that doesn't really answer your question, but I hope it helps anyway