I created this topic to know which tactic has been more effective for the players.

For me, the best tactic is to TFF CONQUEROR V12

That you find more informations here:
http://www.fm-base.co.uk/forum/share-download-fm-16-tactics/355730-conqueror.html
Credits by TFF

With this tactic I won three national championships ( Leicester City 2015/2016 , FC Internazionale 2016/2017 and Valencia 2017/2018);
A EURO Cup (Leicester City);
A Champions League (FC Internazionale);
And a World Cup (Uruguay).