People have so poor taste in knives and skins in general, zero taste, zero vision for what a good inventory should look like, zero consistency, zero idea when and when not to apply stickers to a weapon. I might make a thread for play skins sometime, but the thread would be too long, so this covers knives for now. I also wont elaborate on every single knife and their placement.
S tier: Bayonet, Butterfly Knife, Karambit
A tier: Skeleton knife
M9 Bayonet - this is just a worse bayonet, the teeth doesnt look great and its just way too bulky, this is one of the most overrated knives in the game. I dont get this at all. It looks kind of like Rambos knife (Bowie) but still looks way too awkward. So overrated and bad. Idk if its even correct to say its an inferior bayonet, its probably more accurate to see it as a BayonetxBowie combo.
Talon knife - like the M9 is an ugly BayonetxBowie hybrid, the talon knife is just a way way worse karambit, there are zero situations where its better to go for a talon knife over a karambit, zero. The silhouette is bad, the handle:blade ratio is off, and the cream handle of the talon knife contrasts with the blade in a disgusting fashion, it looks so bad, both the contrast, but also the fact that a cream handle looks awful on pretty much every glove in the game.
Talon and M9 are B tier and what they both have in common is that theyre the two most overrated knives in the game.
G tier (id never in my life use any of these over the default knife, never):
Navaja knife - worst pullout animation in the game, disgusting and awful
Bowie knife - this isnt a knife, its a sword, and its disgusting. So ugly and clunky.
Shadow daggers - self explanatory. Just looks bad. Dualies in the knife slot, lol.
TL;DR: BFK, Karambit, Bayonet and skeleton knife are the 4 best knife types in the game. The rest are pretty bad.