Fonseca will be a terribly risky choice. He surely knows near to nothing about the PL and how difficult it is to adjust (Ask Pep). He knows absolutely nothing about Everton players. It will take him until January to realise what a shambles it is, and by then we could be in dire straights. At least Silva knows the league, but he ain't coming so Welcome Sam for me.
Silva only has about 20 games more experience than him in the Prem and we were all relatively happy with that rumour. You say ask Pep, but he improved the team. Poch. Jose, Pellegrini all came into the league and made good starts too. I wouldnt be to rash to judge as everything needs to be taken in isolation, just cause someone has succeeded, or failed, doesnt mean it applies to all.
Its higher risk, but id argue its much higher reward too