To be fair, both platforms have their pluses and minuses.
Let's start with bedrock's pluses.
It's very accessible, since you can play with your compact device almost everywhere on the planet, which is a huge plus.
It has a large playerbase and not too many games, which results in basically no waiting time between games.
As well, we should mention, that cheaters there aren't as creative as they can get in java, plus the Bedrock community seems to be way nicer, probably because gamodes like Duels and FFA don't exsist there currently.
Now, the minuses:
The PC players have a significant advantage over mobile device players, simply because the computers nowadays can be way stronger than any mobile phone/tablet, so it is way easier to play.
Most importantly, using a mouse will ALWAYS be better, compared to tapping with fingers, because you can click faster and turn around with more precision.
That's Mojang's fault in my opinion, they shouldnt've released Bedrock Minecraft for PC's.
There is a serious lack of staff there, as far as I know, and many people are unhappy with it. Sadly, that only depends on how many people want to be a staff member on the Bedrock platform and how confident they are.
For now there aren't ANY seriously pvp oriented gamodes like Duels and FFA there, but since a developer got hired to work on them and the news said that they might transfer it to bedrock none of us can really complain about it, if they get transferred:)
Java's pluses:
It has a ton of gamodes, if we include the featured gamodes that change in a couple of days always, so everyone can be happy with it.
It has much staff, so much that reports get dealt with in a couple of minutes, we get new maps often, and same goes for new updates.
Sadly it has some flaws:
Sentinel bans falsely a lot, which may frustrate some people.
Some gamodes are really unpopular and Java has got a significantly smaller playerbase, which makes sometimes waiting a nightmare, if you want to play a less popular gamode.
Some people are really toxic there.
My guess about that is, because there exist clans and everything is just so competitively oriented and etc.