I live in the SF Bay Area where we have a Muni "subway", if you can even call it reminiscent of one and BART. They're both absolutely awful, between not having good/expansive coverage/timely service. A plethora of issues plague both.
Both times I visited NYC this year I took the subway everywhere. Out of probably 40-50 subway rides, only a handful were delayed either in-tunnel or while I was waiting in the station; the trains were pretty much all clean without odd (read: nasty) smells. And, of course, the routes go all over Manhattan rather than just through, say, Lexington or Park Ave (like how SF's Muni basically converges and mainlines under Market St.).
I found NYC's subway a pleasant improvement. Yet I keep seeing articles about how it needs to be fixed.
Just interesting to spectate as an outsider.