I'd much prefer slots because I don't have the time to learn the basic strategy for video poker but I can definitely see why people would prefer the latter.
People who do not want to know many things will select slots as the easiest gambling games. People are trying to play video poker because they feel that the game is more exciting than the other gambling games or they can see that video poker is the game they are looking for because they already have the skills to play that game. People will choose whatever gambling games they want to play and if they think that they have skills in certain gambling games, they will play that game and will not play the other as they do not know how to play that game.