I think they taste about the same, but I think the long ones are more convenient for grilling. It kind of depends on how you like your eggplant. (Me, I love eggplant pretty much any way you can think of — grilled, fried, Parmesan, baba ghanoush, marinated, Chinese stirfry, baingan bharta … yum!)
I’ve had other people tell me they couldn’t get many, and I’ve been wondering for a while if the reason I get such good pollination is that I have two different kinds of plant. I thought maybe you might have some insight on that, given that you’re growing multiple plants — is it just that you need more than one, maybe, to set a good amount of fruit?