I'm not a beginner, but not extremely fast either. I just think this would be the place for this question.
I was watching Yu Nakajima's videos of him just annihilating his cubes.
I noticed he build's his blue cross first most of the time. I didn't see that part, because it's on the bottom, but most of the time he had white for OLL going on. I thought this was a beginner trait, and that the extremely advanced solvers start on whatever is mostly done. Perhaps I'm wrong?
I normally do the blue cross first, too. For me it's just easiest to recognize the rest of color orientations. I tried a red cross once, and try to haul *** through it, but it slowed me way down.
What about all of you. Do you normally start on the same color?