So I have a GP Premium based site and the ability to use either WP Rocket or Hummingbird Pro for caching / optimization. Does GP Premium work better with one vs the other?
Perhaps this could aid you on your decision but do note that this is roughly around 2 years ago. It’s possible that WP Rocket made improvements within that span of time.
It’s quite hard to tell without having the actual data. I highly suggest doing an A/B test for your specific site.