I'd get the Delica if you're looking for a good general purpose EDC knife. The Dragonfly is a nice, small, and handy utility blade as well, but if you are going to find yourself doing an appreciable amount of cutting, having a slightly larger knife can be preferable (mainly for the larger handle). I don't think the Delica will replace the Skyline in your rotation. I have both, and they both still regularly make their way into my EDC rotation. They're very different knives, but they both carry, handle, and perform very well. I think you'll find both have a place in your EDC rotation.
My only experiences with full Spyderedge knives were on a Salt 1 and Delica4. The serrations cut very well, but they're not going to give you as clean a cut as you'd get with a plain edge when cutting some materials. Also, from what I've read, H1 steel with a full Spyderedge will keep its edge as well as any of the super-wear-resistant steels. Unfortunately, I traded my Salt 1 before it got any real use (I was favoring the Delica4 FFG vs. the saber grind w/ SE).
Another thing to consider is that all the full Spyderedge blades are a left-handed chisel grind. For peeling an apple, if you are right handed, this would work well if you are using a grip like you would on a paring knife. If you are cutting downwards (eg. cutting the apple into wedges on a cutting board), the left-handed chisel grind can be harder to control. If you're right-handed, the left-handed chisel grind also works well for wood carving (eg. sharpening a pencil, or making feather sticks on thinner twigs). The scallops on the serrations do make it a bit tougher to carve thicker pieces of wood, IMO.
Here's some size comparison pics for the Delica and Dragonfly next to a Skyline and SAK (since you mentioned already having those).