Counterpoint Research's latest data on the smartwatch market indicates that 48% more of these products were shipped in 2019's first quarter (1Q2019) compared to that of 2018. Apple still has a considerable majority in these terms. This may have something to do with the ECG functionality of its fourth-gen Watch.
https://www.notebookcheck.net/Latest-report-shows-1-in-every-3-smartwatches-sold-in-2019-so-far-was-an-Apple-Watch.420045.0.html