Comparing the supplication “Ya Allah” with the word of tawhid (the oneness of Allah)

Question:
The questioner says: Shaykh, I have a friend who constantly repeats the phrase “Ya Allah, Ya Allah.” I told him that it is better to say “La ilaha illa Allah,” and that remembering Allah is better than this phrase “Ya Allah, Ya Allah.” What is the Shaykh’s opinion on this?

Answer:
“Ya Allah” is a supplication, so he is calling upon Allah (Glorified and Exalted is He). There is no doubt that the word of tawhid (the oneness of Allah) is the best thing one can speak: “La ilaha illa Allah, Muhammad rasul Allah.” Yes.