Best version of Adam excluding IG Adam. He gets his Soul Gem so he can fight no Soul Steal though. He gets rest between fights.
Adam Warlock
1.Guy
2.John
3.Kyle
4.Hal
5.Sentinel.
pre52 versions of GLs
DIG
DigiForum Leader
I actually think Classic Warlock is a horrible matchup for GLs. The karmic blast in particular nukes focus and concentration, which is exactly what they need. Most - probably all - have more raw power than Adam. But I think all but Sentinel lose the majority.