If, for some reason, you still use the Galaxy Gear, then it is worth noting that an important change is headed your way from next month. After August, it will be impossible to install any new apps on the Galaxy Gear, although other avenues are available.
https://www.notebookcheck.net/Samsung-s-last-Android-Wear-smartwatch-will-be-unable-to-download-apps-from-next-month.549310.0.html
That watch was based on full Android, not Wear. It came out a year before Wear debuted.