Based on our record, Autoptimize seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
The issues your site are having are troublesome for most small site administrators: good score on Desktop load but lousy on Mobile load. There are also good paid options for someone to professionally optimize the site using the above plugins (e.g. link), but do due dillgence before you hand over the keys (admin login) to any budget service to work on your WordPress installation, as it can end in tears. Source: over 2 years ago
WP Rocket - WP Rocket offers a caching plugin for Wordpress.
Screencastify - Free screen recorder extension for Chrome. Capture, edit and share screencasts. No software download required. Works on Mac, Windows and Chromebooks. Screen RecorderFree screen recorder for Chrome.
WP Fastest Cache - The fastest and easiest wordpress cache plugin.
Loom - Loom is a screen recording extension for Chrome that gives people the ability to create and share media. Create your own videos using your camera, screen view, and audio. Read more about Loom.
WP Super Cache - A very fast caching system for WordPress that produces static HTML files.
SketchCasts - A weekly screencast, all about how to use Sketch