I'm backing OG later, I think whoever wins this one have a good chance at taking the major group stage spot and OG is probably more desperate to get every win possible since they failed to qualify last season and need to get every points they can get if they want to secure a spot to TI.
The game is about to happen within less than an hour, I'll be with OG too. They've only lost two series on this DPC season since the start of the tournament and since week 1. Although Nigma is also a strong team and one of the former TI champs, their roster has also became stronger with ILTW and good thing that they've removed their weakest link which is w33ha. He's not that effective anymore and that made them tie with OG in terms of the rankings in this tournament but whoever wins this series gets a better ranking.