Shame there is no multiplayer to test that lol and you said you used howls, I never need magic or anything other than claws to take out dragons or werewolves of higher levels as a vampire and in terms of sheer advantages, VL is superior, however, they also have the most disadvantages such as sunlight, fire and get extra damage from silver/dawnguard weaponry.
No question that both creatures are powerful but speaking in terms of powers and attacks, Vampire lord is the stronger one, their claws can poison you, they can heal with power attacks and can have a field of bats around them. They can hover over water and therefore move faster than anything that needs to swim.
Werewolves are strong and can knock creatures flying and like you said though, once a werewolf gets something on it's back it is usually game over but that won't be a fair fight if you do not let your opponent even get up or have a chance to engage you in fair combat and so that would forfeit a fair one on one fight between a vampire lord (no magic) and a werewolf (no running attacks or knock back/down attack ) and would not count as a victory.
In terms of a full on fight with all tactics and a werewolf could be allowed to use its knockdowns and ragdoll attacks etc and where a vampire lord can use its magic, vampire lord would be superior since they can telekinetically throw a werewolf around and even kill it instantly by throwing it down a mountain or stairs. A werewolf that got the drop on it and/or used its attacks first though is another story and if you keep attacking it while its down or knocking it down again then a werewolf would win. In the end, they are both powerful dangerous creatures with their own advantages and disadvantages. It also depends on the player's skill. We could wait for a youtube video to pit them against eachother as there is someone who does requests. In one video, the wild vampires who cannot turn into VL wiped the floor with the werewolves when they were pitted against each other.
That video was of AI controlled vampires and AI controlled werewolves, both of which are no where close to how strong a player controlled werewolf / vampire. I don't think wild werewolves even scale as high as I do, so that video only shows what the AI is capable of not what players are capable of. It is too bad that there isn't a multi player option, this would solve the matter of Werewolf Vs Vampire lord.
Vampires can easily kill werewolves just as much as vice versa but since they were created by hircine, of course they would be superior hunters but that does not make them superior monsters. Volkihar master vampires can be lethal if you ain't prepared for them. Werewolves, I have never had trouble dealing with them.
Because your dealing with an AI werewolf that only scales to a certain point, if you where to face me then you would be in trouble. I have a thread going since April, all about the in's and outs of being a werewolf, what spells carry over, hunting tactics etc...etc.. I have been playing a werewolf on master difficulty since pretty much day one of the games release so I have the advantage of knowing all there is to know about being a werewolf, you vampires have only had the VL for 6 days now. You add in the new perk tree that I have and I become the most dangerous MONSTER in all of Skyrim, think of it like a first person shooter, you always get you butt handed to you by the ones that have been playing the longest and have had the most practice.
Charge one head on they Can use Vampiric Grip to throw you, try run around them the same thing will happen. We only need to lock onto you for a second for the grab to work, then we spam the Paralyzing spell to keep you on the ground. Get too close we turn into bats and get behind you, paralyze and repeat. Mist form can also make us invulnerable to damage, rendering your attack useless.
I would imagine it would be difficult to follow the Mist as well if it got out of your line of sight. And we can also slow time with our "Supernatural Reflexes" to even the field when it comes to speed. Werewolves may be threatening, but between being Paralyzed and tossed like a ragdoll there isn't logically much else you can do to us. If you call the Werewolves we can summon Gargoyles, and while they aren't nearly as strong the AI has a habit of honing in on them. You can either jump in to kill them, or run past towards the Lord. In which case the Lord can toss you, repeat steps above. Not to mentioned with you Paralyzed the called Werewolves will be as easy to deal with as the Gargoyles. All we have to do is keep you immobile.
All your buffs are pointless if you can't move. You may be able to destroy just about everything in Close Range, but Vampire Lords are more built to combat Werewolves than other creatures. The only way you can win is if going against the AI, like Harkon, and we all know Computers =/= Human skill. There is no way for a Werewolf to handle a full Powered Vampire Lord.
The only way for victory is if you sneak up on us, which will be fairly difficult given our detect life Spell. And Werewolves aren't the quietest runners either. If you can think of any other way to win other than sneaking, besides blindly charging in with your claws of doom ,which doesn't even come close to the 'intelligent strategy' line, I would be more than happy to hear it.

Go to general discussion and look up my topic call " A call to the wolf pack ", you will see just how prepared I am to face you fangers

There are members of the pack that have a 80% magic resistance while in werewolf form, then there are werewolves like myself that are " beserker " werewolves ( I'm an Orc ) which have a huge health and stamina pool on top of the extra from the perk tree, on top of the Lord stone, on top of Beserker rage and verious spells that can be cast before changing into a werewolf. Then there's the different hunting tactics that the pack has developed over 3 months of trial and error testing.