The difference is that on Reddit I got suspended from the entire site for "report abuse" because I (correctly) reported misinformation in r/conservative and it hurt the snowflake mods' fee-fees.
In other words, Lemmy is structurally superior because there are no fascist admins with the power to ban you from the entire network.
It's full of bad faith arguments, putting rules before humanity, the strictest possible interpretation of those rules, and they LOVE to put words in your mouth or waste your time asking for resources that they won't read and will just respond "What are you even talking about?" because they've already moved the goal posts. Their newest mod spent his first hour as a mod getting in fights about Hunter Biden's laptop and is so vehemently against tax increases because he's one of the rich whose taxes would probably go up. He'll gladly tell you that the rich are already paying TOO MUCH and they wouldn't benefit from paying more.
But, hey, at least they ban the R word and homophobia.