Yes, Adsense is one of the biggest advertisement company who provides a better rate for every thousand of views and a better rate for CPC or every ad clicked! Some website offers "Advertisement" as well, but if you're going to check their ad, it is just an adsense and they are going to split earnings with you!
Some sites will mention "We have an advertisement marketer team" which is a lie for me, some of them will just simply use an adsense ad and act like that they have own advertisement.
Go ahead! Join straight to adsense! Don't join other ads company! Focus on advertisers that will give you good profit, not 80% or 70% and worst 50%
AdSense is a popular way to monetize websites by displaying ads on them, but it may not be the best option for every site or every website owner. There are other ways to monetize a website, such as affiliate marketing, sponsored content, and e-commerce. The best way to make money on a site will depend on the type of site, its audience, and the goals of the website owner. It's a good idea to consider multiple monetization options and experiment with different methods to find the best fit for your site