Fader it would be nice if the developers included this plugin in the list of Nginx modes for full support.
There's nothing to support. As I said above it doesn't actually do anything caching related on Nginx, so wpfc is the mode.
The plugin doesn't do actually do any page caching with any server. It interfaces with Litespeed Server to purge cache etc when it needs to (but it's Litespeed Server doing the page caching - same as Nginx does).
The plugin authors don't claim it supports Nginx - they just say it works on Nginx (and Apache), i.e. some of the other features work, not anything caching related.
Fader I tried all the cache plugins and concluded that Litespeed cache is the best, even paid WP-Rocket losses.
You need to compare like with like to draw any useful conclusion. Some cache plugins actually do page caching, some just interface with the server level caching, some also do optimisation stuff. Then there are plugins that just do optimisation stuff and don't do caching. It also depends greatly on your particular use case.