It has been recently reported that the Nintendo 3DS version of Dragon Quest has been outselling the PS4 version.  There are numerous factors might contribute to why the 3DS version of Dragon Quest XI is having more success than the PS4 port.  One of the reasons could be that more people have a Nintendo 3DS opposed to a PS4 since its less expensive.

Another reason could be that most people generally like to buy shooter titles for the PS4 mainly because they have great online multiplayer modes.  While RPG games are also popular on the PS4 games as Dragon Quest XI are not quite as popular in America like they are in Japan. Even though, the quality for the PS4 port of Dragon Quest XI might be superior the Nintendo 3DS seems to be doing surprisingly well in terms of sales.