It's probably blasphemous for me to say this, especially as a newcomer, but I like Josh Rosen more than Jared Goff. Full disclosure, I'm a Bruin alumnus, but I think Rosen's intelligence would benefit from McVay's complicated schemes. Plus, Rosen is considered one of the most natural throwers at the QB position in recent memory.
Concerns over his personality are overblown IMO. He comes off as a smart guy who is just unafraid to speak his mind. The problem with Rosen is that he will try to force throws into coverage at times given his confidence in his abilities, but that same confidence also allows him to lead his team in comebacks. Having said that, Josh Allen has the highest upside out of all the quarterbacks in this draft class as a boom-or-bust pick but Sam Arnold probably has more intangibles and a higher ceiling than Rosen, who is the more NFL-ready of the bunch. Baker Mayfield seems like a wildcard as possibly the good version of "Johnny Football".
By the way, I eventually liked both Goff and Carson Wentz leading up to the 2016 draft, but I was actually campaigning for Wentz at the time.
Goff is obviously the safer bet during our current window for championship contention, but I think Rosen will be the better QB over time as long as he goes to the right team. I'm not even saying Rosen will be an all-time great, but it just seems like he and McVay would be a great match together.