According to PUBG Corp (via The Verge), PlayerUknown's Battlegrounds Mobile is fielding about 30M active daily users, the same as Fortnite does across all of its platforms. The company further reports that it has about 200M users altogether, the same as Fortnite. In an interesting side note, the numbers that PUBG Corp is touting exclude China, which would likely send the player number count much higher therefore exceeding Fortnite's population.
Also of note is that PlayerUnknown's Battlegrounds Mobile recently scored the "Best Game of 2018 on Google Play" from both fans and editors. This award is an honor that Fortnite cannot earn since Epic has a proprietary download for the Android version of the game.
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Do you play PUBG Mobile?