Supernatural reflexes would also be useless against a werewolf as It only lasts a short time and the werewolf's sprinting speed would put them roughly on the same level. The bat form has a very limited range and would only succeed in buying the vampire a few seconds. Mist form could be useful to regenerate magicka and health but it would also be easy for the werewolf to follow leaving it to whoever struck first as soon as mist form wore off.
As for spells vampiric grip has limited range, high magicka cost, low choke damage and the throw ability only does major damage on cliffs. Summon gargoyle would be useful using the necklace to summon two and could distract a werewolf's summons. Corpse curse would win the fight for the vampires but how would they aim it and hit reliably a werewolf traveling at full speed? Finally drainball is powerful but is going to have no effect against a charging werewolf as there are only so many the VL would be able to cast before the werewolf was on top of them.
On the other hand werewolves have superior strength, speed, stamina and health (debatable) and the only totem power that would be of any use in a 1v1 situation in an open area would be brotherhood. By summoning the werewolves at the start of an encounter the werewolf gives the vampire the option of summoning gargoyles to distract the summoned werewolves (giving the werewolf time to reach the VL) or the VL could directly attack the player werewolf giving the two summons time to close in and stun the VL and give the player werewolf time to recover.
Because A VL needs to use all of its spells/powers in combination and in a PvP situation there would be no way to pause the combat, it is stuck using drainball, one spell and one power to defend itself from a werewolf with two summoned ones behind it. Unless the VL gets lucky and makes a hit with corpse curse the VL has no chance to switch spells and no chance to cause major damage.
In the end the VLs reliance on magicka is its weakness and with the wolves superior experience and tactics would mean that the wolves would come out on top 9 times out of ten, the 1 being for a lucky shot with corpse curse.