@zak /e/OS is a more complete, full-fledged, end-user ready OS than Lineage, I believe. They also have their "easy installer" tool for some devices, so it was pretty easy to install. They also sell devices with /e/OS preinstalled via Murena, a related company. They have their AppLounge, privacy tools and more. Integration to their Murena-Nextcloud-cloud. /e/OS is not perfect, getting better, active development. I haven't tried pure Lineage myself, so cannot really answer.