Saturn's apparent magnitude from Uranus is +3.228. Jupiter orbits closer to the sun than Saturn. Can we therefore expect Jupiter’s apparent magnitude from Uranus to be dimmer than Saturn's, or is it in fact brighter?
I started Stellarium on my computer and pressed F6 to bring up the "Location" window.
Then I changed the planet to "Uranus", and marvelled at the view of the many rings and many moons from the planet's "surface"
For convenience I clicked the buttons to remove the ground and the atmosphere. then I found and clicked on Saturn. It had a magnitude of 3.74. I then pressed F5 to get a time window and stepped one month at a time while watching the change in Saturn's brightness. The maximum I could get was +3.55 (in 2042) though it is believable that it could get brighter at a more favourable elongation in it's elliptical orbit. I also noted that as Saturn passes in front of the sun, its magnitude gets much less, well below naked eye.
I then repeated with Jupiter. It has a maximum brightness of +1.55 (in about 2031) but again, it is believable that it would be brighter at a more favourable elongation.
At its brightest, Jupiter is a lot brighter than Saturn when viewed from Uranus.