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my vantage proI have both. I carry both. I consider them very different knives.
Delica - Carries nice and slim, but not deep. Slices like a banshee. The VG10 takes a fine edge. Mine locks up solid with no blade play. As with most Spyderco products, the fit and finish are top notch. But the handle is thin and if I am expecting extended cutting, I look elsewhere. Also, I can bend the handle a bit if I am using a lot of pressure. I consider the blade very pointy. I'm not really a fan of that.
Vantage Pro - Carries deep, but it's considerably thicker in your pocket. Locks up like a vault. The S30V will keep cutting longer than VG10. I don't find the handle slippery in the least and find it very comfortable for extended cutting duties. No hot spots. Built like a tank with thick G10 and steel liners. But, doesn't have the fit and finish of the Delica. Mine does not open well with just the flipper. It will outcut blades made of fancier alloys because the blade geometry is so outstanding. The shape is just perfect for me. The blade on mine is not centered. Makes me no never mind because it does not affect the function of the knife.
Bottom line. I like both. I carry both. But not for the same purposes.
If fit and finish or thin pocket carry is your thing: Delica. It is a nice knife and mine finds pocket time.
If good solid user for extended cutting jobs and will cut for a long time between sharpenings is what you want, Vantage Pro.
I carry my Vantage Pro more often than the Delica.
Edited to Add:
Having re-read the OP, I will add that VG10 will hold a fine edge longer than S30V, even though S30V will keep cutting longer.