Once the transition to the new architecture is complete, stock edge drivers will be delivered to all customers as part of the hub firmware. There’s no public channel to subscribe to.
Right now, things are different. The stock drivers are rolling out in limited sets as part of the automatic migration. There’s no way to choose one individually for download like you can with a custom edge driver.
Some people will tell you to subscribe to the Official Beta channel and tell you there’s no difference except they haven’t been released for distribution yet and the beta has more device fingerprints. Which, maybe, if the only reason they haven’t been released is because of something in the automatic migration isn’t ready yet for that device. But there’s no way to know for sure. I, personally, would assume if it says beta, it’s beta, and might have some glitches.
The problem, of course, is that you have to remove any custom DTH’s for that device to manually transition to an edge driver, and once you do that, you can’t go back. So if you get an edge driver from the beta channel and it doesn’t work, you might be stuck until someone creates a new driver (stock or custom) which does. 
It’s a very stressful time for all of us for this reason. Things that worked may stop working and you can’t go back: you have to find a new way forward.
So…if what you have now is working with a groovy DTH, my personal advice would be to leave it alone unless you have high confidence that there’s an edge driver that does work. If that happens to be a stock edge driver that isn’t on your hub yet, you can try contacting support and see if they can get it for you. But remember once you get it, you can’t go back.
If what you have now is NOT working, then I think there’s no harm to in trying something from the official beta channel. You shouldn’t be any worse off even if it doesn’t work. But that’s a personal choice.
Here’s the official announcement about the Beta channel with its invitation link.
Note that although the announcement Says you can revert to the previous groovy DTH, it was written in August 2021. That option was removed early in 2023, and you will no longer be able to go back to a custom groovy DTH; only a different edge driver, or a stock groovy DTH if there is still one on your hub for this device.