What build should I do for X style?

Refer to the above section. The various styles don’t actually change the stats you want in any meaningful way. Reaching the Stamina goal is always the most important, then having more Speed is always better than having more Power (as long as your Power isn’t super low), etc. All it changes is which cards you bring, to give skills for that style, e.g. Eishin Flash as a Speed card for Late Surger skills, or Narita Taishin as a Speed card for End Closer skills. Late/End umas do not value Power over Speed.