VG-10 is the class act of the steels you have mentioned and is my favorite and in may opinion the BEST all around. Arguably as good or even better are: D2, M2, and S30V. And this will start some argument but the only folders you'll find that can seriously compete with Spydercos are Benchmades. In the one-hand-open/close/locking folder business these are the only two names you need to know. BTW many benchmades are in 440C or 154CM, which are good steels, with their better models in D2 and M2, and I believe they are starting to use S30V. Spyderco uses VG-10 for the most part, with S30V on their higher end models.