Yeah, I use WP rocket. It's the most compatible and easiest to configure with woocommerce from what I have read. Varnish is more suited with higher RAM configuration.
I had a dedicated server once with 16G of RAM and ran Varnish with it. it was incredible to see it in action. Had a paid service that simulated concurrent users visiting the website up to 2000 or more (I don't remember now) to stress the server and see the website loading time and RAM usage.
The speed was superb and handle everything without a hitch but it used so much RAM.
But this time, I am just came back after years of retirement from website building and marketing. Not investing a lot for the moment so just going for the lowest budget VPS I can find for the moment.
Anyways thanks for your help.
If I make some money on my new venture, I will donate some to the Kloxo-mr project.