There's also been an interesting trend. We complain about imperialism, but a lot of the world notices but doesn't call by name the idea that Saudi Arabia and Iran are competitive imperialist states vying for increased regional power. For example, in Yemen both are causing a huge mess. Saudi Arabia is founded on an inherently anti-Western philosophy which also leads them to prop up Wahhabist groups, yet they have significant deals with the West. The Republic of Iran was born of anti-Western sentiments, but the political trends show they're easing into a different direction. But at the same time you have Khamenei preaching about the high point of economic independence and self sustainability, yet supports gaining indirect political strength in Lebanon and Yemen.
When it comes to Daesh and Syria though, you see it come out complexly. Westerners dislike both possibilities. We accuse Iran of helping Syria (obviously they have an interest, they want to protect Shiites, and Assad's secularism helps that), and give light criticism of the Saudis for supporting Daesh (though pretty hypocritical about it, they're going to want Wahhabis to succeed). Unlike Iran, though, Saudi Arabia has natural philosophical allies in Qatar and the UAE. As a monarchy, the imperialistic positioning of Saudi Arabia will probably last longer than that of Iran, which has a youthful populace.
Of course, these have left those east of the Persians largely alone to deal with their own mess. Rival Wahhabis stuck up in Afghanistan and Pakistan, infiltrated the government of each in some way or another, and work to their own goal, fighting any Wahhabis that don't call themselves Taliban.