So let's take the VN/dating sims, with minimal gameplay element: because of course this can vary too much, if someone likes card game (ahem, Franka) for them games with that kind of gameplay would be the favorite

Consider only the plain story with art and music. What is more important?
Note that I didn't put music - because even if I think it's a very important part of every game, it's really NOT essential (you can play a good game even with music turned off). The choice is between story/writing and art. Of course the ideal would be to have good art AND writing, but this is not about a game's quality. Is about which aspect in a VN is more important for you to enjoy it.
For me the answer is obvious and I'll share my thoughts later maybe, but I'm curious to see what people think!