There are certain factors that could play into a review. For example:
- WP Rocket has an affiliate program (not saying the review wasn't honest, but many are not.)
- Maybe it takes longer for Litespeed to fill the caches. How long after installation was the test?
I had WP Rocket and liked it better than other caching plugins. I had WP Rocket, IonCube, image optimizer, asset cleaner, gonzales.....
For me, WP Rocket was fast in the beginning, over time the performance went down.
Also, I had to exclude my whole theme css and jss. But that is over one year ago. They probably improved.
I could delete a ton of plugins when I got Litespeed, that might also have helped with site speed.
I have a free Litespeed Enterprise server for my important sites (one site on a mini-VPS each) and Open Litespeed for unimportant sites.
I know that you can install the plugin stand-alone, but I don't know how good it is then. Maybe you can ask here
https://wordpress.org/plugins/litespeed-cache/
I like simple. I purchased super cheap VPS on sale from RackNerd so I'm running each VPS for less than $2 per month with Enterprise Litespeed. That's pretty posh.
PS: I have no technical knowledge whatsoever. Just sharing my experience from the view of a non-technical person who for the first time has no issues for months and months.