I think if you want to look at them in a competitive comparison, you might find it difficult. With magic mods I find its less about what's "better" in terms of material advantages, and more about the more complex mechanics and awesome aesthetics.
Botania is in many ways a tech mod disguised as a magic mod; while there are no GUIs to look at or numbers to optimise, there is a mechanical nature to the way things are done in my opinion. Astral sorcery introduces some interesting mechanics and things you have to do to progress in the mod. They're rarely about just a single cool thing you want to build, and more about the whole experience, as you invariably have to go through most aspects to get to and use the later-game stuff.
I guess what I'm trying to say, is that I'm not sure you're asking the right question. If you look at it from purely a "versus" perspective, you may not be valuing the more subtle benefits of the magic mods, such as the experience and fun found in exploring them. Does that make sense?