Depends for me - is the Omniscience Total or Inherent (basically, do I get to choose what I know at any given moment, or do I just know everything all the time?), and could I control the level of distinction I have from everything with Cosmic Otherness? There are certain things I would prefer to keep (e.g my humanity and emotions), but the idea of being distinct from the grand design is appealing to me, because I don't like the idea of my life being dictated by forces beyond me.

Having thought about it a bit more, here's the conclusion I've come to:

Considering the characters alone... probably Lucifer. But this is considering the abilities put forth, so with that context, I would probably choose Omniscience/Absolute Otherness.

The page for Cosmic Otherness implies heavily that the user is capable of controlling the extent to which they are different to the rest of totality, allowing them to 'forgo, include, and deny every physical/metaphysical concept, law, and substance'. Basically, they choose what is a part of their existence. They possess an absolute level of 'otherness' that allows them to distinguish themselves from everywhere, everywhen, all laws, logic and limitations, essentially meaning they operate off of no rules whatsoever, or that they operate off of rules entirely distinct to them.

Either way, the end result is an existence that adheres to no rules recognisable to the totality - even almighty laws do not apply, as they are distinct from them - granting a godly level of freedom that allows the user to do essentially anything they want.

And Omniscience could be dealt with easily. Even if it is total, the user possesses a mind that can be absolutely distinct from the totality, allowing them to reshape their mind and consciousness however they please. They could split their mind into an omniscient but unconscious side and a non-omniscient but conscious side capable of pulling information from the omniscient side, or just make themselves distinct from the ability of omniscience to remove it entirely.

TL;DR: Cosmic Otherness heavily implies the user can control how distinct they are, so with that in mind, the possibility of being completely free from even the grand design is too good to pass up on.

@AzQth i loved your answers. What do you think if i swapped omniscience with supernatural intelligence how would you describe it. Like a human having having superhuman intelligence plus cosmic otherness. And since you would be a super genius you would by extension have an encyclopedic knowledge right. I think sometimes in fiction supernatural intelligence isn’t really useful correctly and to it’s full potential.

@HardwareDakotaverse sorry, I don't know how I forgot about this for so long. Anyway, I would make the point that Cosmic Otherness would likely completely dwarf supernatural intelligence due to being distinct from intelligence itself. Assuming, however, that the user chooses to include the concept of intelligence and to include the ability of supernatural intelligence in their being, they would still wield godlike capabilities - if they dislike something, they can literally just choose not to include it in their being, or to use only their own, altered version of it.

I suspect you asked this to get an idea of the power of Supernatural Intelligence when combined with this ability, to which I am unfortunately going to have to respond with by saying that it's rather irrelevant. Take a look at Fathomless Mind to get a rough idea of the mind of a Cosmic Other.

Thank you