I still had the best time on livejournal, personally. On Twitter you write something and it's instantly gone in a wall of other tweets, or possibly not even seen by anyone because the algorithm decides it's not worthy.
On LJ, it felt like people took more time to actually write something of essence, and have some meaningful discussions in the comments. Not that that never happens on Twitter, but i felt like it was just a much nicer place to share and discuss things.
For example, on LJ there used to be Fursuit LJ, an absolutely amazing community with good discussions, people posting tutorials, etc. This has been replaced by a Telegram group called the WIP Zone. The issue is, there are 1500 people in there, tens of thousands of pictures, and if you post a question there it will instantly be buries under hundreds of other messages. Noone would even bother posting tutorials anymore, and finding anything there is essentially pointless. I feel fortunate that I still had the amazing resource that was the Fursuit LJ available to me when I started, because there hasn't been anything like it anymore after LJ pretty much died.