I think Stan has hit it on the head once again.
In our company we swap legs.....that way every flight everyone gets a kick at the cat....
My only concern is an approach to minimums with a low time co-pilot. If we are going to fly a leg where I feel we will get to minimums on the approach I prefer to have the co-pilot fly (right seat) so that I can monitor and then I will take control at minimums when we become visual...
If the roles are reversed then I have to rely on him to decide if we are visual or not..... maybe not the best option with a low time co-pilot.
This transfer of controls only happens at minimums in poor weather.....if we break out well above minimums it is simply "visual... look up"
Cheers