When doing tasbih after salah, do I say Subhanallah 33 or 34 times?

After Salah, the Sunnah is to say SubhanAllah 33 times, Alhamdulillah 33 times and Allahu Akbar 34 times. There are various different narrations where the Prophet varied it. For example, at some times he would say 10 times SubhanAllah, 10 times Alhamdulillah, 10 times Allahu Akbar. So all of them are fine and sometimes actually better to practice on different ones. So you're acting on different aspects of the Sunnah of the Prophet Muhammad.