I don't know, I don't visit either of them, but I've noticed that all TikTok videos that are supposed to be funny aren't funny. Also my mom tells me that there are TikTokers doing things like leaving Coke bottle bombs on the ground to blow random people's arms off, dunno how common that really is.
LinkedIn, on the other hand, I find actually disturbing because it shows me how friends I used to have have become totally brainwashed by and immersed in corporate mentality, like their whole minds have been rewired for the purpose of succeeding in the capitalist workforce.
Neither of those things is particularly "cringe," though. As for which is worse...I'm not sure.