UX is probably a matter of habit, I for one find the chesscom UI unintuitive and I can never find what I'm looking for, but Lichess certainly also has its problems.
The free and (to me) intuitive analysis tools on Lichess are the killer feature for me.
I very much disagree. Chess.com has analysis being more human-readable, the Lichess graph of move strength is amazing for zooming in to your major gamechangers.
The free and (to me) intuitive analysis tools on Lichess are the killer feature for me.