When in Ruku do you say Subhaana Rabbi Al-Azeem or subhana rabbiyal adheem?
Rabbi al- and rabbiyal are the same thing. While the “al” belongs to the second word, it is joined with the first word during speech, since it makes it easier to pronounce this way.
It is adheem with the Arabic letter “dhaa”, sometimes called “thau”. Since some people have difficulty pronouncing this letter, they may say “azeem” instead.
Subhaana has a long “aa” sound in the middle, somewhat like the sound in the English word “mark”. Some people may write it as subhana.