Samsung S5 Graphics Error under Lineage
A nightly build is a BUGGY build . A different one is compiled EVERY NIGHT , and that’s why its called a nightly build.
This is how bugs are corrected. Enthusiasts and developers try out the new build and try find the bugs and solve them so that the next nightly build will have less bugs. After some some weeks/months , they manage to make a build stable enough to be used on a daily basis. This is the build that ordinary people download.

You should use the stable build if you want a stable OS. Stable builds might be released once a month or once in two months.