Google Scholar is still not universally admired, with suggestions that it is not sufficiently selective in the sources it counts for citations
But like rankings, people still go to Google Scholar and its citation record is a good-ish guide to journal standing.
The new metric just announced rates articles per publication for 2014-18. Overall Nature leads for citations with a five-year H-index of 368. The next 99 publications are all in medicine/STEM with the 100th being, Annals of the Rheumatic Diseases, with an H of 121.