The primary caching feature in Comet Cache and Comet Cache Pro is static page caching. Comet Cache additionally offers Browser Caching options the use htaccess code. If you are using any Comet Cache Browser caching code options/htaccess code then do not also use the BPS Speed Boost Cache code, which is Browser caching code, with Comet Cache. See this forum topic for additional help information about Comet Cache Browser caching options/htaccess code: https://forum.ait-pro.com/forums/topic/comet-cache-installation-and-setup/
Cache plugins are great to improve your website performance as slow websites is one of the factor that directly affects on your traffic as well as decrease your followers. If your website takes too much time to load then it is one of the drawback that needs to be improved. I always prefer some best cache plugins https://www.wpblog.com/best-wordpress-cache-plugins/ to properly optimize sites.
Well mate using 2 different plugin for same thing always get conflict with each other in WordPress. There are some great WordPress plugins like WP Super Cache, Breeze Cache, W3 Total Cache and WP Fastest Cache. No doubt all cache plugins works perfectly for millions of WordPress users but I personally like WP Fastest Cache and Breeze Cache: https://www.cloudways.com/en/free-wordpress-cache-plugin-breeze.php. Cheers