If Navi wins it's obviously between electronic and s1mple, as they both carry the team in god mode. Currently s1mple is only slightly better stats-wise (leading by +0.04 in rating), so I think the finals should decide. Who makes more impactful plays and frags in the final gets the MVP.
Both of them are best rated players in the tournament by far though, maybe they even take it if Navi loses the match.
If Astralis wins it can be anyone from device, dupreeh and Magisk. Though I think device will take it.