watchers seem like they should be very powerful -- near galactus levels according tp uatu LONGGGGG ago -- but they have pretty poor showings in battle. a rogue watcher struggled with quasar, (as sixth knows QUITE well . . . 😄) and aron, while powerful, didn't have that great a showing against the ff. course, the watchers were crushed by the celestials -- even the most powerful watcher was destroyed by the judgement of the celestials. i know the celestials are tough, but still . . .
given that ganthet has the powers of the other guardians, i think he'd be pretty well above any watcher.
of course, i was a little surprised to see ganthet taken over by parallax, who was then defeated by 4 gl's. still, i think ganthet has the better showings overall and should win this fight without TOO much trouble.