Oleophobic I believe is essentially the ultra clear with an anti fingerprint chemical coating. It's the one I have and personally it's perfectly clear to me. Some have said the coating will wear away over time, leaving it as essentially a clear protector. I went with it after looking for previous customer experience and no one could really list any drawbacks to the oleophobic version vs the ultraclear.
The glass one is as per the name, a piece of glass as opposed to being plastic. Apparently it feels good, although I didn't get it because I don't want a case and SGP seem to suggest it should be used with a case to protect it from breaking. Apparently a hit to the edge of it can cause it to crack.