1. Adam. no contest. Hal's constructs couldn't contain the Kryptonian criminals from the PC Phantom Zone story, and most of them were a good deal beneath Superman. (He was practically one shotting most of them)
And PC Superman himself easily defeated a villian using Hal's ring, then called his ring a "trinket".
When Adam and Superman fought, Superman claimed he wasn't even certain he could defeat Adam, and this was outside of Earth S, where he's weakened. He shouldn't have any more trouble with GL then Superman or any other Kryptonian would...
2. Edges more towards Hal. Well made GL constructs aren't so easily destroyed by Superman or characters on Supermans level anymore, and there's exotic powers like being able to warp time, or manipulate the mind.. (In fact, a incarnation of Hal Jordan as a child in The Last Will and Testiment of Hal Jordan" mind screwed Superman with Hal's ring, which is a tactic Hal himself developed. No reason this wouldn't work on Adam.)