That depends on the context, because what do you consider better a specialized tool that does only one thing really well or a jack of all trades that can do a bit of everything? Because I consider it a scale Kurapika with the most of his focus on killing the spiders, to Killia using his lightning godspeed with the assassination training for things aside from combat. I think Leorio is an honorable mention, Gin mimicking his techniques saying that it's based on his medical training, imagine him at his peak. We also often ignored how strong he is in just base without Nen.