That means I need to make a choice: Do I want to get the best sound through the Kabinet or does the audience get the best sound. As I said before, the first option would be the obvious choice... So when it comes to live playing with a PA, I assume that studio and merged profiles are the much better choice than direct profiles.
I wouldn't see that as the obvious choice at all. You are playing for the audience so always make sure they get the best sound.
You will never get the same sound with imprints as the full Studio profile going to FOH. The imprints are intended to sound like standing in front of a real cabinet (no mic used). Whereas Studio or Merged profiles being sent to FOH are intended to sound like a guitar cab with a mic in front.
These are very different things.
The difference between on stage and FOH with the Kemper is exactly the same as it always was with a valve amp and speaker cabinet with a mic in front.
If you want to have the audience hear exactly what you are hearing then you need to hear the full FOH studio profile through a good FRFR. Some people don't like the feel and/or sound of FRFR so accept the on stage and FOH sound wil be different.