Please which is more rewarding with Allah, to recite "Allahumma salli ala Muhammadin wa sallim" OR "Subhanallahi wa bi hamdihi wa subhanallahil azim"?
Praise be to Allaah.
We may combine the two, because it is recommended to send blessings upon the Prophet before and after asking Allaah for anything. It was narrated that sending blessings upon the Prophet is a means of du’aa’ being accepted. This is also true in the case of dhikr using the words “Subhaan Allaah wa bi hamdih, subhaan Allaah il-‘Azeem (Glory and praise be to Allaah, glory be to Allaah the Almighty).” The Messenger of Allaah (peace and blessings of Allaah be upon him) said that both of them bring great reward.