lichess is easier to use and give the user more options such as who you play, what color, time control, and playing unrated.
All those options exist on chessdotcom. Moreover, with a larger pool, your seeks get taken faster.
I thought lichess was faster with pairings plus it's easier to reach the open challenge pool of its slow
At fast time controls, both sites are fast. At slow time controls, both sites have been slow enough for me to give up.
Both favor their presets.
In Arena, Lichess is ridiculously slow.
I can't see a lobby on chess.com and everytime you want to play unrated you have to change the settings. Unrated is good because there is a lot less you know what.