i'll delve into their abilities and stuff later but going off of stats, just off a glance
chihiro
- at least 0.0407 tons
- 0.564 tons with kuro : shred
- 11.28 tons with nishiki
- varies with kuro, going up to 22.57 tons
- up to 33.85 tons with cloaking amplification
- 4223 tons (LS)
yuji
- - 58.4 tons, higher with black flash, even higher with max power black flash
- class 5 LS
yuji has a pretty consistent AP advantage, even at chihiro's highest. cloaking amplification isn't something he can reliably maintain though, so it's suffice to say chihiro will be at a general AP disadvantage here, and that's disregarding yuji being able to amp himself even further with black flash. i think if yuji manages to land a black flash on chihiro he's at best getting severely injured and at worst just dying immediately
on the plus side though, chihiro can amp his speed with both nishiki and cloaking amplification, unlike chihiro. this gives him at bare minimum like a 2x speed amp that lets him be reliably faster. he also has a pretty sizable LS advantage (class M vs. class 5), which will be helpful to compensate for yuji's AP advantage
chihiro should consistently have more ranged options (yuji can technically match his range by just throwing projectiles really hard but chihiro can just fire off kuros from tens of meter without issue), but even assuming yuji has his wire here the LS gap means he's not gonna be able to use it to restrain chihiro at all. both should have pretty similar levels of endurance and both have SW so i don't think either one is outlasting the other in a prolonged battle of attrition
just at a glance i think chihiro having a consistent speed advantage + having more reliable ranged options + danmaku makes me lean slightly towards him but i'll go through their abilities and whatnot later