-Gotoh is a bug compared to GS Killua and even he gave Hisoka a scare, he had to use Bungy Gum traps just to escape death against a Gotoh level opponent.
-running speed over distances has nothing to do with combat speed. GS Killua was so fast a Royal Guard couldn't react to him.
-Youpi did not even have time to roar or transform.
Good luck arguing Hisoka has time to set up any "traps".
As for his attack power and Hisoka's defense.
-Killua was doing this to ants who are naturally more durable in base
-Even Netero's attack didn't manage to scratch a less durable Royal Guard
-yet Youpi probably the most durable character in the manga aside from Meruem, was in visible pain taking Killua's attacks.
These attacks land on Hisoka and you can say goodnight to him.
As for calibers or levels. Let me remind people how strong a royal guard is in comparison to Hisoka.
-Netero seeing Pitou and thinking he might be weaker
This isn't just a case of Netero being humble either since it was reaffirmed by Togashi later
-Netero brought Colt and showed him his Nen to compare to the King, when Colt confirmed Netero wouldn't even be able to get past a Royal Guard after witnessing his nen.
-So Netero needed to go meditate to arguably be above a Royal Guard, pre meditation Netero was highlighted to be below one.
Putting more stock into Hisoka's psychotic urges than all of this can hardly even be considered an argument, besides we're talking about the same guy who thought Chrollo would be a fun match for him, only for him to absolutely get stomped by Chrollo. Also for the people bringing up Illumi's superiority, let's not forget when Killua punked off Illumi
Regardless these instances of mindgames don't mean much to begin with.
Hisoka is not doing jack shit here. We've seen the full extent of pre nen boost Hisoka, he is a tactical fighter who uses traps to get himself out of bad situations, he doesn't have the reactions or durability to even pose any threat to GS Killua. The only way Hisoka stands a chance against GS is with tons of prep before time.
As it stands: Fight starts, Killua blitzes him and his head goes flying. Hisoka won't even have time to lift a finger let alone set up bungy gum traps (Youpi couldn't even let out a yell). There is no argument here for Hisoka, he gets the rammot treatment.
Low diff win for Killua here.