Catan vs Ticket to Ride: which do you prefer?
My unpopular opinion: Pandemic is a better game than Spirit Island. Spirit Island is more complex, more interesting to experienced gamers, more mechanically innovative. But Pandemic is better at what games are for: creating a shared experience where decisions matter and everyone at the table feels engaged.
This is not a slight on Spirit Island. Spirit Island is one of my favorite games. But it requires three to four sessions before new players feel genuinely empowered rather than confused. Pandemic achieves that engagement in session one, with players who have never played a cooperative game before.
Design elegance is not the same as game quality. The quality of an experience includes everything from first-play accessibility to hundredth-play depth. Pandemic delivers on the former in ways that more complex games sometimes sacrifice.