For the wavelengths that the telescopes are designed to observe (primarily ultraviolet & visible for Hubble, though it can do a little bit of infrared, while JWST looks at Infra-red and mid-infrared) resolution is fairly comparable, though JWST has a much wider field of view and doesn't half to sit idle when it orbits the sun side of the earth like Hubble does.

A major issue with Hubble & JWST comparisons is just that they're designed to look at different wavelengths of light. A lot of what JWST will see is completely invisible to Hubble, and no amount of observing time can compensate for that.