Bedrock almost certainly has more players, especially in the younger bracket.

Most adults and definitely most content on YouTube is on Java.

I'm pretty sure it does. Bedrock (aka glorified Pocket Edition) is available on PCs (Windows 10/11), Android, iOS and consoles

I mean, I've seen people talking about Minecraft Java on Android and you can certainly run it on the Stream Deck, but both of these tasks are not something the average user would do