Pretty good overview of both platforms. I have some MANA, but I've never played Decentraland. Never even stepped into it. I'm afraid I'll get sucked in and spend too much time there. But I see it as a huge boon to the future. And, of course, Hive as well.
If you're up to it, I'll be giving a free microclass on Hive on the Clubhouse app at noon CDT today. Feel free to stop by.
I had mana before I played also. It's definitely worth checking out but you might get sucked in. I ended up having to build a new PC so I can play without lag. I don't always consider it but it might be difficult for many to connect if they don't have a strong enough PC.