killua is stronger than feitan in speed but not in strength but yes killua is stronger than feitan when he was killuas age i think
There is absolutely no proof that Godspeed Killua is faster than Feitan. Feitan had like a hundred or at least 50 after images left behind due to his speed alone when he fought Zazan, and he wasn't even in top condition back then as he himself and all the ryodan said when they were watching. At BEST Killua is as fast as Feitan, and even that is stretching it. There are a many characters just as fast and/or faster than Killua, I dunno why people overate him so much. Okay not neccessarily overate him but rather acting like he is the only speed demon in HxH. Feitan, Bonelenov (Bantile Cantablile blitzed that super fast chimera ant he was fighting before he could even blink much less move, and by the time he got to the other side he'd already cancelled battle cantabile and reverted back to normal. There's also the other variation where he uses sound to attack you even from a distance no matter how fast you are, Jupiter it was I think.). And then there is Gon-san, Meruem, Pitou (covered 2km in a split second, and an even bigger distance when he/she reached the throne room with one leap), Netero (hand speed and prayer speed even causes a time dilation, nuff said), Chrollo (has an instant teleportation technique, the one he used on Nobunaga, that's like Minato's FTG accept he only has to open a book in a certain page instead of placing markings), Cheetu (nuff said, he blitzed every opponent he faced and their movements were like slow motion to him), The shark-like guy that Bonelenov fought (although Bonelenov was faster, thanks to speed of sound I guess), Shalnark in his 'super saiyan' mode was incredibly fast and strong too. There are a few others, like Zazan, ofcourse she can't beat Killua in a race just like Netero can't, but he reflex movement with her tail was able to keep up with Feitans attacks, Netero too can't beat Killua in a race, but Killua can't blitz him either cause his hand movement is ridiculous and his budha has many arms attacking and defending from many angles.
Anyway, I think I've made my point here, Killua is indeed super fast and he is at the very top speed tier, but there are many others in that same speed tier, people must stop overhyping him.