I think what @DarJ means is that from what he's seen, the movement of the Winger on Support seems to be better with the cut inside PI or atleast what he prefers compared to the IF with or without instructions.
Personally I agree with him that it's superior if you are looking for the Wingers/ Wide players to constantly be wider but then make that realistic cut in that happens in real life with a lot of players. IMHO- IF's with the PI's of Stay wider typically don't end up doing what a lot of people are actually intending or trying to get them to do.
All personal preference at the end of the day!