This might be a blessing in disguise because this team isn't going anywhere. DLZ would never have had the stones to trade either one of them and we'd be stuck in playoff purgatory for the next 5-7 seasons. Retaining this above-mediocre team would have become unattainable very soon anyway with Gobert's supermax and DM's max + all the other large contracts like Ingles, Bojan (until he's 34...) and Royce (and Clarkson?). At least now maybe DLZ will be forced to act.
As to who should we trade, I'd say Gobert. We simply can't afford paying him the supermax and he's not worth it, with all due respect. It'll be one of the biggest contracts in the history of the league if not the largest at the time of its signing. And then there are his shortcomings which have already been discussed plenty, and while he'll be worth plenty of regular season wins, in a playoff series opposing teams find ways to neutralize him.
Do we suck without him? Absolutely. Are we great with him? No, we're above-average as a team even if he makes us a top defensive team. Trade him for what we can, and build around DM. We'll suck for a few years, but we'll have him under control for the next 5 or so, so we'll have enough time to find out what fits around him and adjust to the direction the league is going, and maybe pick up a few assets through the lottery.
Having said all that, this is a cluster of many pucks.
While I can't blame the Jazz for not trading either one before (never expected them to be this bold), this is exactly the lack of daring and assertiveness that keeps on biting the Jazz time and again. No, they couldn't see this rift coming (I'm guessing. Still don't know how this started or what it is about), but this core wasn't going anywhere and it wasn't hard to see. It could be a nice team, sure, but not a contender, and that was good enough for the Jazz, so they kept riding it. They would never have blown it up unless they had to. Most of our significant assets spent, huge payroll in the offing, value of players diminishing, and now, as stitches described, we're going to be kicking ourselves no matter what we do. Gobert is entering his last year of his contract and due a supermax, so there will be less takers and lower returns. And with the feud going on, the Jazz could really get squeezed regardless of who they trade.
I suppose, if the Jazz really wanted to stay the course and change as little as possible, they could try to do Gobert-Adams trade, since they are both under similar contracts. Not if it makes sense for OKC or not.