gruppo on avenue b is among my favorite pizza places. got their mushroom pie with truffle oil last night and it was delicious as always. pepperoni is also good. nice flavorful sauce, super thin crust. friendly low key staff.
Gruppo (and their sister Posto on 2nd and 17th) are both interesting. Crust is crackerlike, not dissimilar to Il Forno in Providence. Also some unusual toppings. I think I once had a merguez pizza at Posto.