The best are the ones when you choose a flavor that is in a brands normal line and in their "exotic/premium line"
IE, al amir white grape versus al amir exotic white grape. (i reviewed both of these seperately and they we re remarkably ... identical)
You can do the same with say layalina verus golden layalina if they have flavors that line up.
Or al fahker and golden al fakher, etc etc.