There are 3 main type of knives you should be looking into getting if you want the prestige and value that will rise over time.
Karambit: One of the most popular knives in CS:GO, the Karambit is known for its unique curved blade design, which makes it highly effective in close-quarters combat. It’s also one of the most expensive knives in the game.
Butterfly knife: The Butterfly knife is a versatile and well-rounded knife that is popular among players due to its speed and agility. It’s also a very recognizable knife and is considered as a status symbol among players.
M9 Bayonet: The M9 Bayonet is a classic knife in the CS:GO universe. It’s known for its sharp blade, making it very effective in close-combat situations. It’s also a relatively inexpensive knife, making it a popular choice among players who want a reliable knife without breaking the bank.
All the above mentioned knives are popular among the players for their design and rarity, which makes them valuable in the game. These knives are also used as a status symbol among players.