Unfortunately, I think Gypsy may end up on top in this one, and that’s just because it is more corporate looking. The site’s reponse time is a little better, the site is a little more modern, and there’s clearly new products in development. Gypsy says that they will also release a bus version very shortly.
However, SUBWAYblogger has a softspot for the onNYTurf maps. They are more grassroots. It’s a noncommercial effort of real people just looking to provide New Yorkers a great free service. So, I think they deserve all the credit. Unfortunately, a more commercial company might monetize it much better.
Anyway, check them both out and see what you like. If you don’t have a preference, then just stick with the good guys at onNYTurf.