The Locked On pod was discussing this lately too.
Essentially you’re choosing between a future HoFer who is effectively just a DPR now (but still a very good one at that), and a guy who can still play all three downs, while still getting after the passer.
Miller gives you fewer snaps and less versatility, but he’d be an excellent mentor to Lawrence and Ezeiruaku. He probably helps their development better than Clowney could.
Meanwhile, Clowney gives you more on the field in total, while still providing some tuition and encouragement for the younger edges.
For me, I’d be happy to go with either. FWIW, I prefer both to Bosa.