There are a whole lot of observations which lead us to conclude that elementary particles exist, that all the elementary particles that exist conform to the Standard Model, and that the energetic universe is composed entirely of elementary particles. These particles have mass, charge, spin and a rate of decay.
In both QO and mainstream science, the Standard Model has the same theoretical basis: symmetry. The difference is that in QO the symmetry is broken in the ontic realm and is translated into consequences for already existing particles, whereas in mainstream science the symmetry is broken when particles lose so much energy that they cannot maintain all of their symmetry.
Any complete theory of elementary particles needs to explain why elementary particles always behave as waves and sometimes behave as particles. Mainstream science requires a conjecture that there is some mechanism, as yet unknown, which dictates the existence and behaviour of particles, and that this mechanism relates mass, charge, spin and decay rate. That is a complex gap, with an Occam score of 0300 relative to the Big Bang, and 5000 absolutely. The QO account of elementary particles applies QO, without additional assumptions, and therefore has an Occam score of 0000 relative to QO, and 3000 absolutely. It is therefore to be preferred.