I guess we’ll have to see which one is better in the coming weeks/months. But since you can see all the content anyways, I think more important is picking an instance that suits you.

Mastodon is a micro-blogging platform, just like twitter. There are many instances and it’s also federated, so it doesn’t matter which instance you register your account at.

kbin in a separate software from lemmy. The same way that Mastodon is different but still federated.

old.reddit is definitely going soon too unfortunately. I thought I’d just use that, but reddit’s actions in the past few days have convinced me that after 10 years it’s time to go.