i would pick hikaru nakamura
If You Could Go to Dinner with Any Chess Player, Who'd You Pick?

This question was answered in the TV show Columbo, Year 2, Episode 7, titled "The Most Dangerous Match". You invite your opponent for the next day to dinner. And then...
The kosintseva sisters. I feel like they would be so properly etiquette'd at the table. Proper napkin folding, the right butter knife, the correct desert utensils, And they would tell me entertaining stories of their travels around the world. I'd be fascinated to dine in the company of such well mannered professionals. And of course, they're ridiculously adorable.
My wife. She plays and always picks up the bill.