Oxygen Builder is undoubtedly the best builder for WordPress. It has no bloat & fast to load.
It is unlike all other builders for 2 reasons.
First, it does not have a theme. If you load a theme, it will disable it. Instead, you design every aspect of your website, as you would like it to look. In other words, you start with a wireframe or pen/pencil & paper, draw out your website & then design it in Oxygen. You will not be confined by a theme/builder.
It all depends on what you want. If you want to get a website up and running with WordPress quickly then there’s nothing wrong with Divi or Elementor. However, if you want to build a website on a different level using WordPress, Oxygen builder.
Blocs is different in that the website doesn’t have to be tied to WordPress & Blocs 4 has had a very good review.
My advice. Download Blocs to try as a demo. Norm is amazing and very supportive. He also listens to his users.
Download Oxygen for a 30 day trial & get an immediate refund if you don’t like it; or use their demo areas in the cloud. Try Divi & Elementor.
Only you can determine what you like. There’s more than one way to design a website!