Om Swami
Which God is greater, and does it matter which form I worship?
God is one
God is only one, as the line "ekam brahma dvitiya nasti" (Brahman is one, there is no second) says. So the doubt about which God is greater does not arise.
Kabir says: if I call Him one, He is not even that; if I call Him two, it is an insult. If I said there are two Ishwars, it would be an insult to Ishwar.