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I went with the lower CFM fan because it produces less noise. I decided the tradeoff in air flow vs noise was worth it. The other reason is aesthetics. It's a clear fan with no lights on it. For the location in the ceiling vent, I was looking for either clear or white fans.
The one fan moves enough air, in my opinion, but there is always the option to add a second fan to the bathroom. For the kitchen where a 2nd fan is not an option, you may want to look for a fan that moves a bit more air. When I looked at the specs of the original fan, I believe it moved 86 CFM. So, the replacement I put in is just a bit less at 79.
Oh, one other thing I just thought of, don't get a variable speed fan...many use a thermistor in the fan itself to determine the fan speed, which is ok in a confined computer case, but not for this application.
Fred
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