- availability
- quality
- diversity
Others agree:
https://www.bonappetit.com/story/chicago-restaurant-city-of-... (a little bias here’s another one: https://travel.usnews.com/rankings/best-foodie-destinations-...)
You can do a quick search for more recent opinions.
NYC has more top end, famous restaurants. Chicago has more close to top end restaurants that you can easily get a reservation for. Measured by dimensions like # of Michelin stars, Chicago is only behind NYC and SF. It’s ahead LA for example.