Reply To: daven by heart or the nusach in the siddur?

BasYisroel94: Ask a rov or your teacher.

I think Reb Moshe paskens strongly in favor of nusach Ashkenaz, the Divrei Chaim in favor of Nusach Sefard and the Chabadskers in favor of Nusach “Ari” (based upon the teachings of the Ari Z”L, like all the other Nusach Seforad versions of the Chasidim. Only difference is in name).

use the siddur as a guide, but really say the nusach that I ‘know’ by changing words here and there,