Osiris in my opinion is more to the correct fayoumi color (reading what the male should look like color wise). But you should give the other time to mature, you can not judge any bird by that age.... To know if he will be good or bad you need to let him mature (happens usually about a year old, some later though in big/slow maturing breeds).
If you want to breed good qaulity stock (which is rare here in the US, maybe even non-existent.) you should really study the standards (UK would probably be the easiest to find since the US doesn't recognize them yet).... You need to pay attention to every characteristic not just color.
If you don't want to pay attention to every characteristic/breed quality stock. Go with your favorite...