FIFA or UEFA rules for a tie-break in a Champions League group ?

[nikolgiorgos]

The game now is using UEFA criteria as the name is Champions League, based in the relative European competition of UEFA (European federation) .
But every season , a day like this (the last day of the group stage games) I keep seeing posts from managers who don't understand why the finished 2nd or 3rd.
So maybe it's time for nordeus to use the criteria of FIFA for World Cup instead of CL ?
It's more easy to understand them, specially for those who are not familiar with football regulations or with the English language too.

* also to remind you that the criteria for the League winner are based at FIFA rules, not head to head which might making things more confuse.