Like thin crust? Here are some suggestions... Allegro at Wynn had great pizza, it was very similar to what I enjoyed in Italy.
I tried Pop Up, but I didnt get the super crisp crust everyone talks about. I prefer Secret pizza.
Off-strip, I like Custom Built. It's better than Due Forni and a heck of a lot cheaper. Novecento is along the same lines. But Settebello? That's hard to beat.
For Chicago style thin crust check out Windy City Beefs N Pizza on Eastern near 215
Prefer thick? Try their deep dish.
Or Rosati's Stuffed (not on the menu but several locations will make it upon request).
Maybe you're loyal to New York style? Grimaldi's is classic and my choice. But Biaggio's or Cugino's Pizzeria will do.
Want all kinds under one roof, try Pizza Rock.
Then, there's those to Skip.
Streets of New York
Slice of Vegas
And if you're your broke or trying to feed a crowd; there's always Pizza! Pizza! $5 Hot and Ready.