Mnay of us quilt for the joy of creating something beautiful, or something needed, or as a way of expressing love and concern. Only you can determine why you quilt. If your motive is basically for something beautiful then buy the kit. If you love creating, then don't buy the kit. With a kit you are sewing someone else's creatiion, start to finish. Those of us who like to use ideas that are a bit different, or colors that are used just because we like them and can "see" them going together, (think about the "used only stash scraps" quilts that are often posted, so many of which are outstanding), then you have to go with buying your own, or using your own stash.
Some of us zero in on skills and strive toward perfection. Some of us zero in on the person to whom it will go, or a design that is in our heads. Where do you fit? What makes you happy? Thank the Lord we are not all the same!!!!