Two points on transit:

• NYC is known for having really crappy and indirect public transit connections to all three of its airports. It’s hard to go anywhere on transit from any one of them. Jersey City is comparatively better just because it’s a more affordable taxi/Uber ride from Newark.
• A huge majority of Jersey City (and really all of North Jersey) transit traffic has the sole purpose of getting into and out of Manhattan. Trains, PATH, Light Rail, etc. aren’t meant to get you “around town”