IMO the Lichess app is superior. On desktop, the analysis features of Lichess and its database are superior. Ding Liren used the Lichess database to prepare.
I also like Lichess because I can play in arena tournaments against players with a much higher rating than me, which helps me learn - I'm not sure if this is so easy to do on Chess.com.
I paid for Chess.com for a while, but I stopped subscribing when I realized I never used it. Meanwhile I have multiple days of playtime on Lichess. Also, the owners of Chess.com don't seem like very nice people.
I'm pretty sure the pros and streamers prefer Lichess too, but they're sponsored by Chess.com so they have to pretend to like it.
I also like Lichess because I can play in arena tournaments against players with a much higher rating than me, which helps me learn - I'm not sure if this is so easy to do on Chess.com.
I paid for Chess.com for a while, but I stopped subscribing when I realized I never used it. Meanwhile I have multiple days of playtime on Lichess. Also, the owners of Chess.com don't seem like very nice people.
I'm pretty sure the pros and streamers prefer Lichess too, but they're sponsored by Chess.com so they have to pretend to like it.