I'd like to think that I'm not part of any particular agenda at this point, given how new to the fandom I am. That doesn't mean I'm an inherently objective observer on the matter though, we all have our own inevitable biases anyway. That said, I'll try to give an even-handed take on the fight and where things go from here as best as I can.
From what I can tell, the two easiest arguments to make are that the fight was either a tie or that Luffy won a pyrrhic victory against Kizaru. At the end of the day, neither party was particularly interested in properly fighting one another and were instead focusing on either killing/protecting Vegapunk.
Kizaru may well have been holding back from his full arsenal of abilities, given his additional orders to secure the island and Vegapunk's creations for the WG, but the fact of the matter is that the man was out of commission from one good hit of Gear 5 w/ ACOC. His endurance just seemingly isn't able to properly compete with the level of raw power that Luffy can dish out.
However, as others have noted, Luffy is currently looking even worse for wear than Kizaru due to being completely spent after reaching the limits of Gear 5. It's a temporary issue, but one that has resulted in immediate consequences in endangering Luffy's crew, as well as Bonney and Vegapunk. Plot-induced or no, the fact that Luffy can do that sort of damage to Kizaru in one hit immediately paints Luffy's "strategy" in this fight in a terrible light. He had the opportunity to end the fight very early on, with Kizaru quite literally in the palm of his hands... and rather than go all out in taking the admiral down then and there, he just yeeted him away and essentially allowed Kizaru to get back on his feet again.
Not to mention that Luffy waited until the absolute last moment to bother utilizing ACOC while in Gear 5. Had he done so sooner, it's hard to believe that Luffy's victory would currently be compromising the safety of his companions as it currently is.
All of that said, where do we go from here? Will there be a Round 2? Maybe, but I doubt it. Saturn is here and it's rather obvious at this point that he is the primary threat to the Straw Hats, Bonney and Vegapunk now. When Luffy recovers, it's hard to imagine that he'd prioritize fighting Kizaru over Saturn at this point.
More importantly though, given all of the recent indicators that Kizaru is having conflicting thoughts over his orders and his own admission of being just "another cog in the machine," I think there's also a good chance that this will culminate in Kizaru breaking free from his self-induced slavery as a dog of the World Government and fight Saturn as well. And frankly that sort of character exploration and development is infinitely more enticing and exciting to me than the debate of whether an admiral is as strong as a yonko or not.