Yes, Kristakz, that is the stitch I had heard called a "whip stitch". It isn't the same whip stitch I would use when I used to make clothes, but I see the resemblance. I'm going to stick with that. It really does give me a smoother edge around curves & is ever so slightly less visible than the ladder stitch (neither one is very visible -- when I match the thread perfectly, you can't even see the stitches when you squint).
I still love Aurifil thread most of all. I do wish they would come out with a Silk line of their threads. I would definitely be buying those up. But I really like the idea of keeping everything cotton (fabric, batting, thread) and 50/2 Aurifil really isn't visible with an applique stitch unless you are searching for it with a magnifier. I may have to try some YLI 100wt silk in my next applique quilt just to compare. It's always fun to try something new. Just wish they sold spools of thread in something smaller than 200m because it seems like too often I pick very different colors from one quilt to the next. My next organization purchase will definitely be a clear box with plastic dowels to corral all my threads and keep them from getting dusty.