Reddit used to be able to do two things. 1. Allow me to express myself and 2. Entertain. They really stopped entertaining me a long while ago. They also didn't engage me enough for me to want to express myself. I already had a foot out the door.
Point 1 is filled with Hacker News, Lemmy and tildes. They are all similar but different. With lemmy... you kind of take your shoes off and relax (respectfully). With HN and Tildes: you are the best version of yourself.
Point 2 is taken up by TikTok. I use TikTok on an older dedicated secondary tablet with a fake gmail account, no contacts. The tablet only does TikTok and nothing else in order to alleviate privacy issues, etc.
HN, Lemmy, tildes and TikTok provide an experience that far surpasses that of reddit.
It's all personal preference. There's certainly pros and cons to both. I think Tildes tends to have more in-depth and thoughtful conversation than what I've seen on Lemmy so far.
There's docs that details the Philosophy if you want to take a look. I'm personally interested in both for different reasons.