I ultimately have to give my vote to @xzone, even though I think both of you did a good job overall.
Despite, this, I also think you both made some questionable arguments:
@kevd4wg failed to really come up with a viable answer to Stormbreaker. His attempts to argue that Thanos would be able to dodge Stormbreaker were unconvincing IMO. Thanos didn't dodge anything in IW, including things far slower than Stormbreaker like that giant structure than Tony dropped on him. Similarly, his claims that Hela would be able to catch and crush Stormbreaker were dubious at best. We still don't know how Hela crushed Mjolnir (I tend to buy into the idea that she crushed it using her worthiness enchantment rather than her brute strength) or whether this method could be applied to Stormbreaker. And this ignores the fact that (as X showed) Stormbreaker moves through the air while spinning (makes it harder to catch), constantly has lightning coming off it and has a razor sharp edge to it.
As for the claim that Hela could tank a blow from Stormbreaker's axe side...wow... just wow. Hela got skewered by a fodder Asgardian sword, so I fail to see how a freaking "King's Weapon" would fail to kill her. Hela isn't coming back from a slice to the neck or getting a limb chopped off. Kev seemed desperate to emphasise how big and clumsy Stormbreaker is, when the size difference between Mjolnir and Stormbreaker isn't actually that big. Mjolnir got pretty enormous (especially in the more recent movies). There's no evidence to suggest that Stormbreaker is actually that much slower than Mjolnir and Thor would obviously be more proficient in wielding Stormbreaker than Gungnir, because Stormbreaker is very similar to Mjolnir in how it functions. I found the idea that Thor is somehow more dangerous in CQC with random swords than he is with Stormbreaker pretty laughable.
I also didn't think it was fair to compare Thor's fight against Hulk in the arena to Thanos' fight with Hulk in IW. Unlike Thanos, Thor spent a good chunk of that fight trying to reason with Hulk and calm him down. Once Thor got more serious, Hulk struggled to tag him. Sure, Hulk eventually overwhelmed Thor (due to his physical superiority), but the fight was hardly one-sided. And once Thor got his lightning in play, the fight was clearly turning into a stomp, forcing the Grandmaster to cheat. In this fight, Thor has Stormbreaker as well as lightning, putting Thor on a totally different level to how he was in the arena. Current Thor w/ Stormbreaker would stomp Hulk even more easily than Thanos did.
Still, I think Kev did a good job of showing that Thanos is much more of a factor in this fight than one might assume, as well as showing how skilled and fast Hela is.
As for X, he definitely had the harder job here. You did a great job showing how Thor (especially in the bridge fight) was arguably out-skilling Hela and that his losses were more due to her better stats than her superior speed or skill. That being said I felt that you went a bit too far in arguing that Thor "blitzes" people. Thor has never truly blitzed anyone. He bullrushes people and I think Kev did a good job of illustrating this difference. You also downplayed Thanos and Hela's skill, which seemed unnecessary. Still, I think you showed that having a one-shot weapon like Stormbreaker can counteract being physically outmatched.
GG to both of you.