I no longer need to spam my powers, I can call in 2 werewolves to aid or I can just go toe to toe. It's my power swipe that you should worry about, if I get you on your back it's game over in seconds. Or I can have a little fun and play with my prey a little before I kill it.

Legendary dragons are a joke as a werewolf, you can still out run them if you choose to and when their on the ground all you need to do is avoid the mouth and the tail. Stay at their side and slash away, if they try to take off then I power swipe to keep them in spot. Both my paws are doing around 160 damage ( I don't remember the exact number ) and I can swing them as fast as a pair of daggers, if I use the brother hood howl then that adds an additional 4 paws all doing the same amount of damage, all swinging just as fast and all able to do the same power swipe. Right now with the perk tree filled out I have 600-700 stamina, and 500-600 health plus the Lord stone then you add in the fact that I'm an Orc that can use Beserker rage before changing into a werewolf and I can cast Dragonhide before changing, there isn't anything any VL can do that will even dent my werewolf.

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.