Zubs subs is the best. But for chains, Jersey Mike's, Jimmy John's, Firehouse
are all good.
Subway is absolute trash. It must be Yewts and trolls voting for it. Blimpie and Quiznos are a step up, but still far below JJ, JM and FH.
There are a few here I have never tried but want to, like port of subs and pot bellies.