Hi. I've tried Ocean WP and Generate Press, I've never tried Astra. I use Elementor PRO and Thrive Architect, but I'm obsessed with the SEO Friendly theme and upload speed. What combination of theme and visual editor recommend me to comply with what I want?
Really though these differences are not THAT significant because all the tools you are listing are really good to begin with.
Either way you are going to have to use a caching plugin to optimize your website.