So again I like the subtle differences between the O5e and LU Vampires, which is good for the backwards compatibility that is a advertising hallmark of the game.
The LU vampire is 2 CR lower but its not that much weaker than O5e (again showcasing that standard monsters have often been over CRed in O5e, something that experience has proven out over time). The charm is "technically" a little weaker as the OG version specifically calls out that the victim will protect the vampire, whereas the LU one is the standard friend. However, the ability to use the charm as a defensive reaction is gold.
To me the real highlight is the bite. As more of the LU's damage is focused on the bite, the extra max HP damage combined with the strife will ensure that a party feels a vampire encounter long after the fight is over. That is a common criticism of undead in 5e, there lack of debilitating effects, and so its great to LU bringing some of that back.