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I've tried both, and have always had better results from ICNR.
I never have the time or inclination to take darks at the same temperature, and as others have said, when the temp drops, if you don't have darks to back it up then you may end up with no ability to do any dark frame subtraction.
It's up to you though - if you can get dark frames working well for you, it's definitely much better for productivity.
My experience hasn't been as good with them, so I stick to ICNR simply to ensure that a good, clear night of imaging (all so rare for me these days) isn't ruined by not having any dark frames.
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