The stakes in Iran are far higher, and we will take action against Iran first.
Well the costs of action are higher in Iran also, and there might be some chance that a democratic revolution in Iran will take care of regime change without us. So I'm not so sure.
The stakes in Iran are far higher, and we will take action against Iran first.
Syria should be neutralized before taking on Iran, and the sooner the better.
We don't need all the problems Syria could cause on our flank (or in our rear, depending how you look at it) if we take on Iran.