It's the same OS, and 99% of people that install Lineage install the GApps otherwise the device is barely usable.
if you're not, you can still use Gapps nano or pico. thats basically just the play store and the service api.
[0] https://microg.org [1] http://opengapps.org
It's the same OS, and 99% of people that install Lineage install the GApps otherwise the device is barely usable.