Resolution in km/pixel at:
(i) the closest approach and (ii) typical when in close to Jupiter part of the eccentric orbit.
The difference for Juno is that Jupiter is the main focus of the mission, whereas Galileo was more about the moons. Juno has more instrumentation for investigating the clouds, magnetosphere and mass distribution of Jupiter. Juno's polar orbit allows close imagery high latitudes that were never imaged by previous missions.