Although it's substantially more expensive, it's definitely better for you as it's grown without the potentially toxic pesticides, herbicides and growth hormones, unlike conventionally grown produce. The more natural (ie: chemical-free) our food is, the healthier we'll be...it's common sense. I'd rather eat an apple (or any kind of fruit or veg) that has a few marks on it than a perfectly smooth unblemished item covered in all sorts of chemical gunk that's completely invisible.
Of course, if we choose to follow an organic diet it's important to be certain that what we're buying IS actually organic, and therefore that we're not getting ripped off. Purchase your produce from a reputable organic shop, direct from a certified organic grower, or best of all, grow your own organic fruit and vegetables, if you have the time and space in your yard.