I still love Katz, but Schwartz is pretty amazing as well. The flavours are different, I'd say the rye bread at Schwartz is better (more moist and has a fresh springiness to the texture). Because it's a smaller shop, the line is quite daunting when you first arrive, but it moves fast, and yes I would say it's worth the visit. Don't bother getting anything else but a smoked meat sandwich with pickle, you miss the point of going to Schwartz if you're not going to indulge in the smoked meat.