Indeterminacy has all the powers i like so i chose it, it also seems more versatile, since you're not stuck to one thing, like magic

Yea, but you're not stuck to one things since you are beyond absolutely everything, you don't use magic, you don't need a God's help, you don't always have to be the author, you are already beyond absolutely all dimensions, and you aren't stuck to only creation.

Well I agree with you @Nicholas8293

I just picked Almighty Magic because I found it's description of it's power and applications more appealing at least to me.

Although I don't get the appeal of Author Authority. That just sounds like a lonely existence since your the only character who is aware that none of your world is real.

AA is more like you treat all of reality like fiction, it doesn't necessarily mean that all of reality is fiction tho.

I wish to possess an inner god to communicate with in times of wisdom and the such

I personally disagree with Beyond-Dimensional Physiology being an Omnipotence Derivative. Dimensions don't necessarily encompass everything (e.g Meta-Concepts are beyond dimensions on a conceptual level, and absolutes are beyond them on all levels), so being beyond dimensions wouldn't really give you power over everything like an Omnipotence Derivative is supposed to do.

I mean, in the end, it would depend on the author, but this is just how I think of it.

Anyway, as for the powers here:

• Almighty Magic: Omnipotent Magic, it's between this and Irrational Indeterminacy (I'm assuming it's irrational because that's the Omnipotent level of it) for me. Being able to do absolutely anything through magic is nice, though for some reason I prefer the idea, at least at this kind of scale, of possessing power without justification.

• Inner God: on the one hand, it would be good to have some other being handling all your power for you, but on the other, I don't really think I'd want another sentient entity within me at all times.

• Author Authority: I agree that this one would seem lonely. I mean, I guess when you get down to it, even loneliness would be words on a page to you, and couldn't apply to you unless you allowed it to, but I still don't think I'd want it.

• Beyond-Dimensional Physiology: being beyond dimensions, all the time? No thanks. Everything I know and care about is within dimensions. I'm not giving up on that xD

• Grand Design Construction: I hate the idea of fate, and this would be essentially imposing the highest form of it. No thanks.

• Indeterminacy (Irrational, I assume): it's either this or Almighty Magic. It's mostly dependent on whether I would retain my identity and individuality after becoming beyond scaling and definition. Assuming I do, this would be my pick. It would be impossible for anything to define me unless I allowed it to, letting me be whatever I want to be without the constraints of definition, even at an absolute level. It would be impossible to define a limit to what I can do, so I would get that 'doing absolutely anything without any justification'. Can achieve impossible feats such as 'greater than totality' or 'beyond omnipotence' in the way that only a truly Omnipotent being could.

So yeah, under the assumption that being 'beyond scaling and definition' doesn't inherently lead to me losing my identity, emotions, etc (which many of the users don't), then I'd choose Irrational Indeterminacy. Otherwise, Almighty Magic.