I don't think there is much of a difference, but who knows. There's no data to suggest either way
The reason I suggested giving it a go in SI is because it is much more reliable than mirror. They both share the same API, so in an ideal world the same script code would behave the same on both clients, but in reality SI is much smoother. Since they share the API, there is nothing I can do to make it work on mirror (if it is having issues) - that is down to the developers.
Best
Apa