Fact is the two are extremely close in GT racing when both in peak form. I think ultimately when going for their top 3 week performance over a GT route a lot of it depends on circumstances. For instance: Had Pog had his team last year, had the weather been cooler (with more rain), had he been properly fed in Granon, had there been no Roglič to mess with him, had the route suited him more (or Vinge less) and had he not thought he was invincible, we might have had a totally different race. But still even in this case, saying he would be head and shoulders above Vinge in any (or all) of these cases in currently unfounded.
I still think Pog is better overall in GT - but I'm open to changing my mind if Jonas wins over him convincingly without a clearly favourable circumnstance. The latter will be difficult because there will always be the "wrist excuse" for Pog.
But the real question is: what happens if Pog focuses entirely on Tour de France. I still hope that will never happen but if he loses this year again, he may have to reconsider his priorities. That's why I think it's in our best interest Tadej wins or at least comes very close. Else we are back to the days of extreme specialization where other races will get less international attention...