24 is "standard", but 30 fps makes things look a little nicer/smoother. Unless you are doing something for a speciality agency, perhaps stick with the standard 24fps, because usually that is what customers are expecting.

In a word, no.  It doesn't.  Subject matter is the most important.

But if you're concerned, shoot 120 and let the buyer decide their own frame rate, as 120 is divisible by 24, 30, and 60.

Hmm, sounds good but mostly accepted frame rate is 60fps or I am wrong?

thanks for the responses.  it makes sense that the quality of the shot and subject matter are more important.  i may conduct a small test by shooting similar shots in different frame rates just to see if there's a difference at some point.