I think eUnited will give a fair fight to 123. They need to win to keep hopes alive and to show that they are not done yet.
I would then bet on a 3-2 that can go eitherway. If I had to pick one winner it would be 123 tho.
This match could be the make it or break it point for eUnited, to finish in the top 4 they either have to win all matches after this one, or every match save for the one vs Gigantti to guarantee themselves a 4th spot.
In terms of advantage I think eUnited have the better DPS core, but their lack of an actual off tank flex player might be their downfall once again. Like Rogue they've never looked very comfortable running the D.Va and I've never seen a Zarya from eUnited so overall I think 123 are in a better position to win unless they come somehow make the triple DPS dive work like it once did.
I think that 123 win 3-1, but I can see this going the other way if key players on either do/don't perform.
Edit: Spelling
Sounds silly because of how they've performed in the past but I think it might be time for an eUnited roster change. The triple dps dive meta is over and they really need a proper flex player. If the team is looking for a spot in OWL (which to be honest I doubt they are), I reckon they'll change it up by the end of contenders. Perhaps they'll look at doing a Rogue and take on board the UK team. Can't see this roster staying as it is with the new meta if they can't perform under anything other than dive.
Well assuming they find a home for OWL the team would need to expand anyways. No team is going in with only 6. They will have more players that can adapt to the current Meta. I don't think they need to take anyone off the team. I think teams like Rogue and eUnited probably just need more time to adapt their players to new heroes.