I think you would prefer downtown JC (Montclair and Maplewood/SO are better suburbs with walkable downtowns, but you will need a car). But downtown JC is probably what you’re really after lifestyle wise. Tons of restaurants, bars, gyms, etc all walkable. I wouldn’t bother with a car, I would just rent as needed on weekends or take the train though US trains pale in comparison to Europe.

I’m a realtor and would be happy to help you find what you like and can do virtual tours to help you get a feel for an area. I think you’ll prefer the ease and charm of downtown Jersey City.