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Historically hg had the more intuitive interface[1] and git had better performance. Hg's performance has improved a lot (partly because Meta uses it). Git's interface has improved as well, but I know it too well now to say if it's as intuitive as hg; certainly many hg proponents say it is not.

1: I don't have any hard data for this, but I don't think it's overly controversial.

Google uses it also, though heavily customized.

Megarepo (read monorepo) setups probably ? anecdotally I’ve heard git having a problem with that use case.

Considering that the Linux kernel uses git, that particular anecdote's problems could probably be attributed to a cause other than their choice of VCS.

The Linux kernel is not particularly big by comparison.

Although I suppose you could argue the cause is the choice of keeping so much in a single repo (I certainly would).