Yeah, I think what happens is people that can assume everyone else can and people that don’t do the same. The problem is that both call “seeing in your minds eye” (or whatever) two different things. When I read something like that I used to think “ok, so imagine it?” I had no idea some people coult literally SEE images with thier eyes closed. It’s called visualization and there are ways to improve it (I’ve heard. no success though 
)
anyway, in regards to the technique. There is no best technique 
That depends on the dreamer and how they sleep. Another thing is practice. Some techniques demand a bit of training to get them to work. If you just tried a few days each tech, maybe you can try a whole week of total dedication to one? WBTB also greatly increases chances of getting lucid, specially in combination with another tech. This topic might help though. There are other good topics in the knowledgebase too, in case ou haven’t read them yet.
As important as techniques (if not more! - in my opinion at least) is the mindset. Trust that you are perfectly able to lucid dream (because you are, just like the rest of us) instead of putting all your trust in a technique. It’s perfectly possible to LD with no technique at all, using just confidence! And try to take it lightly. Although it can be hard to avoid, frustration can really come in the way and make it take even longer to get a LD.
Hope I could help, good luck! Feel free to keep the questions coming 