Murray is my favorite of the 3. Guy is a straight-up winner who will do whatever it takes to get the victory, but at the same time isn't as reckless as Mariota. Russell Wilson is honestly the best comparison.
Lock has the most play under his belt, and I don't really think he's as erratic as Daniel Jones. Much safer, much more pro-ready prospect. Lock was projected as a first rounder if he came out last year, but chose to go back to school.