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It depends on the object, the seeing, the altitude, etc.
For Jupiter, I use 30fps for all 3 channels, and just adjust the gain to get the same histogram for all 3 channels.
For most filtersets, they don't all have the same cutoff in each channel. For the astronomiks, the green channel is almost always brightest, and blue is almost always dimmest.
Saturn is so dim at the moment, that even at 15fps for R and G with 100% gain, the histogram was under 50%. On the blue channel at 15fps, it was just too dim so I dropped to 7.5fps and the histogram was about 50% for blue.
The astrodon's that Anthony uses appear to be very good.
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