Admittedly, it's kind of a toss-up where you go for pizza in Born, because the two best places are basically next to each other: Gusto and Pizza del Born, respectively. However, the thin crust and the great selection of vegetarian slices gives Gusto del Born a slight edge on their neighbor.
For a quick lunch, Gusto is hard to beat. If you'd like an empanada with that, then down the road to Pizza. But both choices should leave you satisfied.
Look out for the daily specials, which are great value at 3,50 euros.