I am voting Zombina, actually.
First of all, the biting situation is unrealistic on both ends given SBA and in-characters actions. Zombina doesn't bite, she appears to have a moral objection to purposefully infecting people (Yuuhi's zombification seemed to greatly distress Zombina) and her verse's zombie infections aren't combat applicable in strength so she wouldn't even have a reason to try weaponizing it. You're only zombified by her bite if you have a compromised immune system, or if you're dying, it's purposeless to do it in a fight. Which Zombina also wouldn't do because while she does
like to rush in, she doesn't like to CQC, she keeps her guns on the target.
As for Murphy's bite, it has more combat value...but they're shooting each other and the fight starts many MANY meters apart, it seems unrealistic to even both attempting that in this situation, especially considering my later points.
Secondly, SBA wouldn't start them a 4km, it would start them at several hundred based on Zombina's ranges. A glock
only has an effective range of about 50 meters according to our pages, so Zombina's more varied arsenal holds a range advantage on Murphy and she'll get the first shots of the fight in. Considering her high fire-rate, duel wielding, and her skill as outlined in her intelligence section, Murphy's eating some lead early, and could very well go down in the first wave of gunfire then and there depending on where her shots land. Watching the justification for Type 2, Murphy's kind of zombie can power through certain shots very effectively, but that high fire rate Zombina touts isn't going to be any fun regardless of his survival.
Which moves on: Zombina will probably realize he's either a zombie or non-human early if he survives that first round. Zombies in her world come in all sorts of variants, but many are indistinguishable from a normal human and are just as intelligent, so Murphy's appearance and intelligence won't mean much in hiding that fact. Zombina and Murphy's zombie physiologies are very similar, so everything Zombina knows about her own kind will be just as applicable against Murphy, which is especially good for Zombina since Shiishii is also an undead that she frequently rivals and has dealt with in the past, which means she doesn't just know how to fight a Zombie who has similar traits to Murphy but also has experience in changing tactics to do so.
Which also brings up the point of skill, experience, and tactics. Zombina does love to spray-and-pray and rush into battle, that is absolutely true, however that's not without purpose. Her opening scene where she shows that off, it was part of the greater plan coordinating with the entire team. However there's a number of examples of Zombina shifting tactics and being creative when the situation calls for it. She shot through her own body when restrained to escape a hold up close, she set up for an ambush against 'D' and kept her range, and she set up a trap to ambush Shiishii as well. She had enough discipline to keep the line when attempting to arrest Rachnera instead of just charging in as well. Zombina likes her 'charge, pretend to get shot, play dead' method, but it's not her only tactic, and having range she likely won't sacrifice that for no reason.
And with that range: Zombina is noted as being comparable to Manako in her intelligence section, who lands long-ranged sniper shots for the team and has done so in hostage situations. Zombina just doesn't
like to do this, but realizing that she's dealing with an undead at a range? She should be entirely capable of focusing in to land more devastating and well-aimed shots on her target. Which agian, her experience and knowledge means she should realize what she's dealing with at this point fairly easily, even if she doesn't realize he's a zombie she'll realize the completely wild spray of bullets didn't quite work the first time.
And if she does realize he's a zombie? She knows what to do about them and does possess anti-undead rounds.
Furthermore, Zombina's stealth skill can't go understated. She's shown the ability to hide and plan ambushes, and is perfectly willing to do so undetected. If Murphy attempts to break line of sight or forces her to? Her commando training will likely be more effective than his skill at that point, giving her the edge with the environment. She did so with both 'D' and against ShiiShii, and in ShiiShii's case that was almost certainly 100% her own plan without the possibility of her taking orders to do that.
Plus, thanks to having a range disadvantage, the possibility of Murphy firing a non-optimal shot at some point isn't terrible. If he EVER misses his shot, Zombina can use her play dead tactic which might put Murphy in a really poor position without him even realizing it. He needs to make up a lot of ground, all while under gunfire from an opponent who's going to get a read on the situation, to make sure he lands a more realistic shot to go for her head.
My TLDR:
Murphy's clearly skilled, and almost certainly smarter than Zombina in most ways. But Zombina has the starting range advantage, her arsenal has a massive fire-rate and versatility advantage over his, her home-verse knowledge and experience is highly applicable against Murphy's philology, Zombina's experience and skill with her firearms is actually higher than she portrays herself with thanks to Makano scaling and she's proven she's not so undisciplined that she won't changed tactics or think creatively, and she's shown the ability to make use of her stealth and plan out traps and ambushes when needed some of which she prepared on her own outside of a team setting. Murphy may need just 1 clean headshot to win, but I think Zombina's too varied and overwhelming with too many options.
