Nothing can be acquired from both of those fights. They were totally different. Morg tackled Thanos to the ground. Mar-Vell punched Thanos through the ground (which is more impressive). Morg took a blast from Thanos (with effect). Thanos never blasted Mar-Vell, so we can't compare blast durability. Thanos never struck or choked Morg so we can't compare their durability.
That's why I hate when people use faulty logic when they are using ABC logic.
Edit :I'm wrong. Those fights did show evidence to who wins.I would say Mar-Vell wins due to his blasts being more powerful than Thanos blasts. Thanos 2 shotted Morg. So he would easily put Morg down.
