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Each filter will add a little bit of detail and it may be necessary to use several filters to capture all the detail you can see.
With a 4" (what I use on my patio), I've found the following filters useful:
Jupiter: #82A light blue (dark bands), #80A Blue (bands again), Baader Contrast Booster (enhancing bands again)
Mars: #25 Red (dark markings stand out), #23A red-orange (dark marking stand out), #21 Orange (sandstorms and desert features and dark markings), #15 Yellow (sandstorms), #82A light blue (ice cap and limb clouds) #30 Magenta (blue and red features simultaneously), Baader Contrast Booster (desert features and dark albedo marking simultaneously--my favorite Mars filter)
Saturn: #82A light blue (bands on planet's surface), #12 yellow or #15 dark yellow (details in the rings)
My best view of every planet has been in perfect seeing at high power.
But each of the above filters has helped me see one feature or another.
Be sure to use at least 100x for Saturn, at least 80x for Jupiter, and at least 100x for Mars. If the seeing doesn't allow that high a magnification to be used, you're not going to see much.
The good news about filters is that by restricting bandwidths in the spectrum, they also reduce the effects of seeing conditions.
For me, Mars is sharper at 200x with a Contrast Booster filter than it is without a filter.
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