Okay so, canonically, Ascended/Ori (literally the same thing) can create and destroy planets with a thought. Youngins might be a bit drained by that for a while, but they can still do that. For the most part they don't, for various reasons but mostly because it's not necessary. From what I can see, Asura still have to physically throw things at each other to fight, instead of just willing each other into non-existence, which would mean your Ascended would win by default as they can just vanish the thrown object and create their own travelling at arbitrary speeds. Not to mention being able to phase though solid matter.
Saying that though, something else must be going on because the Astra's Wrath dudes are throwing planets at each other at velocities that are clearly superluminal, yet they somehow remain spherical, so we have to assume something is holding them together beyond mere gravity. Does this interfere with an Ascended's ability to vanish matter? Is that property actually key to the attack rather than the physical object (think payload vs missile)? Difficult to say because the "physics" of Astra's Wrath is so ill-defined.
Tangent to that, I will say that the Ori were almost certainly never as strong as some people like to imply; sure they had a galaxy of believers, but how many people is that, actually, if the population is mainly confined to small towns around the gates? And how does their faith/belief being founded on ignorance and falsehood affect things when Daniel was able to channel Oma's power into straight telekinesis with about three hours of instruction? None of the Ori galaxy's "faithful" managed that, not even the Priors and they had their magic staffs to help them.
