Ok stun yes, forgot that its dark magic. The others no, they are all Enfeebling magic. I guess it really comes down to if you are a stun whore more often than you are enfeebling hard targets. Stun whores need more magic acc for stun once it gets resistant, but enfeebling hard targets is hard enough you really get a boost from merits. In my opinion though, I wouldn't bother meriting GEO, then again, I have no interest in the job. So I thankfully will never have this dilemma.