Sorbillo's is the best I've tried. I remember walking in front of the shop a few times and thinking it's some kind of tourist trap (it's on the possibly most touristy street in the city), but decided to try it out in the end. Absolutely fantastic. The pie was great, but TBH I think there were other places in town whose pies were as good, but the quality of the toppings... just wow. And I was surprised that the price was the same as any other place in town (I think a marinara was something like 3-4 Euros).

My second favorite is in Switzerland of all places, in the small town of Meilen. Amazing toppings too. But I went there once since the start of the lockdowns, and it didn't taste as good. I don't know if it's the pandemic leaving a bitter taste, or just an issue for their supply chains...