I'd say 240 because it is the size most people have a strong frame of reference too. Don't want to risk the whole "It may just be the length, I have only used one knife in this range, but it felt a bit ...." thing. Nothing magical about a 240, I just think most people have a good reference point in that size.
If anyone has not handled one of Marko's, and wants to buy one, but is on the fence, get in on this. His knives are top notch.