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Basically as Kevin says (for any given integration time) short subs rule for virtually everything (e.g., avoids the need for guiding and good mounts, problems with intermittent clouds, star saturation and bloat, satellite trails, wind, etc. etc.). EXCEPT for the nasty reality of the read-noise floor (...okay, and maybe excessive processing time). It's that read-noise limit is the real the kicker in astroimaging, as I explained in your previous thread on this topic. If we ever get a near-zero-read-noise camera that otherwise performs well on QE etc., then everyone would be doing super-short subs and 'lucky imaging' for DSOs. Right now only planetary imaging can get away with this, because the inherent SNR is so high that even millisecond subs get well above the read-noise floor.
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