Yah, that’s what is..Saudis & co vs Iranians & co.
One point to add regarding the Iranian expansion. Approx. 85% of the muslim world is sunni (including in that salafis & wahabis). So I’d say in numbers at least Iranian expansion is almost fully stretched. They simply won’t have the religious support from the rest of the muslim world. It’s not nearly an even match if the idea is to play the sunnis collectively against the shiites. That’s why the Islamic regime in Iran has failed to export its version of an Islamic state to the rest of world after some 35 yrs, whereas the Sunnis can do that more easily. Considering also there are more Arabs than thos of Iranian heritage, even those who aren’t muslims.