There are many important differences between Nginx and Apache, and this is not a question of opinion. Nginx is in first position when working with high traffic sites, and it’s processing model is proven to be superior.
PM me with a contact option (email, phone, Google Meet, etc), so I can explain in detail all the steps necessary (our company can do it for you or you can also do it yourself, you choose).
It’s important that the Wordpress site must be well configured and clean and I completely agree that, if not-well configured, Wordpress can easily be really slow. But a good Nginx FastCGI cache, along with a proper Redis cache for dynamic requests (ecommerce and admin, for example) can help a lot. Every optimization that we do we re-run multiple benchmarks to present the difference and gains.
In my company, I manage and optimize Wordpress sites to be able to receive dozens of millions of access per month.
I’m at your disposal.
Cordially,
Paulo Coghi