The 27-year-old left the Gunners for Manchester City in 2011 and says the move was justified by his first league title with the Etihad Stadium outfit.
But Nasri has also defended former club Arsenal and feels they are not too far from Manuel Pellegrini's side in terms of success.
Manchester City are struggling to defend their league title this term, anyway, but any initial disparity is simply the result of Arsenal having to repay the cost of building the Emirates Stadium, according to Nasri.
Indeed, the Frenchman feels Arsene Wenger's policy of buying youngsters (something he was forced into due to the restrictions of Arsenal's budget) is what separates them from a title-winning club like Manchester City.
Asked about the north London side's approach, Nasri told Sport: “It works at Arsenal. It has worked for years. It’s just that, when they built the [Emirates] stadium, they didn’t have the same budget that they used to, so they couldn’t have a competitive team.
"Wenger had to change his approach by buying young players. You need experience to win those kinds of trophies and that’s the main difference – that’s it."
The league aside, the Gunners did win the FA Cup last season and have the chance to do so again this term, with a quarter-final tie coming up against Manchester United at Old Trafford on Monday night.
As for Manchester City, the title chase continues - but time is running out unless Chelsea can produce a major slip-up.