Here's a post from the 2010/11 season when Nani was doing superbly on another forum -
Explains the difference pretty well.
Nani has more significant upside easily too and more unpredictability but then he needs to make use of it and up his game consistently. For 2010/11 he was a regular for us when he was performing superbly and was probably the best winger in the league, but then he got injured against Liverpool and came back blowing hot and cold. And when he does that he gets frustrated and doesn't give as much discipline either.
Nani by now should have grabbed his opportunities by the scruff of the neck and advanced that conversation, but he hasn't. Then he would have had all the top clubs after him and us desperate to keep him with him cemented in the first team, but it's still excuses excuses excuses.... like with Ando but to a lesser extent.
Thought it was a car crash of a post personally. And V-1000.... what the flying feck?
And the bit about forging partnerships, well, I'd say Nani makes Evra better than Young or Giggs do and Rafael better than Valencia does.