What knifes are good?

Hey peeps I’m pretty new to the game and I was just curious on what you guys think of the knifes in the game. I’m asking this because I’ve been wanting to get the black market butterfly knife or the reaver karambit (which the reaver karambit in my shop right now) but I’m not exactly sure if these knifes are considered good for their price.

I’d really appreciate if y’all could help with wether I should buy the reaver karambit too match my sheriff or wait for the black market butterfly knife to pop up or to just not buy them at all because they aren’t good. Thanks again for reading this and if you have any questions please ask.