It's all hoo-har really. Unless you're using a really outrageous sugar (honey, caramel etc) it just comes down to connoisseurism. Which is insane, because most people are just happy if their home brew doesn't taste like vinegar.
If you are just trying to make something that is drinkable then yeah, it doesnt much matter. Once you have accomplished making something decent tasting, then you will be able to notice the difference. cane and corn sugar have different residual taste and body when they ferment out. even if all you are making is sugar wash for distillation, its a noticeable difference.