Lichess is great for casual player but for more serious play chess.com is preferable because of stronger competition.

For serious play i'd say it is chess.com, playchess.com(Chessbase parent), ICC and only then Lichess.

In some UI aspects Lichess does feel nicer and lighter.

That's just the nature of the open-source model, the money is sorely lacking for promoting chess professionally.

Maybe some day the Patreon model will transfer to attracting top GMs to Lichess but for now they might check out Lichess and then leave immediately such as was the case with Wesley So earlier this year.

By comparison chess.com has the money to attract strong titled players to its online tournaments and even sponsor strong over the board tournaments such as the recent Isle of Man super Swiss.