Curiously...

[PSALM19.1]

My 9mm TMB is EXCEPTIONAL on the Moon but my 6mm Orion Edge-On is better on Jupiter...eyepieces, interesting beasts :question:

[Atmos]

Could be the smaller exit pupil for Jupiter that is making the difference :shrug:

[Tropo-Bob]

Generally, the nearby Moon shows well even with low magnifications. But, more magnification is required to see the vastly more distance planets.

What is the telescope that U are using?

[raymo]

The 6mm obviously gives a much higher magnification, which often would
give a somewhat softer image, but if the seeing is very good, Jupiter can take very high magnification successfully. A very good higher mag image
will be more detailed than a lower mag one, and therefore more
enjoyable.
raymo

[PSALM19.1]

Hi Bob, using an 8" Dob....

Thanks Raymo, yes, having thought about it, the 6mm EP would throw up a better view on a good night and that particular night was better than average...The Moon is the interesting thing for me (and this was on the same night): the 6mm was obviously a larger image and still great, but the 9mm had a better "colour" to it and more detail that sort of "stood out" almost immediately, yet the oposite was true of Jupiter....I used to have a 9mm plossl and it was no where near as good as my 6mm Orion; the TMB is a vastly better EP - on the Moon it would seem! :)

[Atmos]

Maybe a 9mm will just show better colour than the 6mm due to the lower magnification. We're not as good at resolving colour as structure.

Depending on where both the moon and Jupiter are in the sky makes a difference.