There is something, rather than nothing. How can this be accounted for?
Mainstream science does not really have an explanation for why there is something. It merely hopes that there is an explanation. Because so many things appear to exist independently of each other, and we cannot set any a priori limit to the number of factors which are required to explain them, the mainstream science non-explanation amounts to an unbounded paradox, with an Occam score of 5000.
The QO explanation also involves a paradox, since it is not in the nature of absolute nothingness to produce anything. But it is only a complex paradox, because only the initial quantum and the rules it obeys need to be accounted for. That gives it an Occam score of 3000. It is therefore to be preferred.