Larger flower, possible better disease resistance. Haven't had any problem with it falling to virus in the many years I have had it. Different people have different experiences with different things. Seems like I had heard it was more prone to virus, it just hasn't been my personal experience.
Some of the "new improved" lilies haven't done well here. So perhaps it's a little bit of trying to buy what you like, seeing how it does for you and evaluating your own space. But most of all, enjoying every minute of it.
