I believe the ghost xv uses a newer fiber vs the 452x in the high octane strings. The XV are supposed to be a little more stable with less stretch but both receive the same pre-stretch treatment at the factory so who knows. I’ve had very good luck with the high octane strings.
The XV strings are a new blend closer to the newer BCY 454 material while the high octane strings are 452x like others mentioned. I just bought my first set of gas strings and went with the high octane set and it seems like a great string so far