Werewolves only get disease immunity, vamps get disease and poison. Werewolves can transform only once per day for a short time and cant transform back at will, vamp lords will be able to transform back and forth at will and stay transformed as long as they want. Also werewolves arent that strong and do get attacked by wolves and werewolves so i dont know what you're talking about
According to the wiki they don't get attacked by wolves and werewolves.
Advantages
Max health and stamina increases by 100
Very fast sprint (faster than horses)
Slight vertical/horizontal leap increase
Sprinting power attacks cause all enemies smaller than mammoths (including giants) to ragdoll
Frenzied attack (holding down attack similar to a flourish)
No carry weight encumbrance (though you also cannot pick up anything)
Crimes committed as a werewolf are not attributed to your character (no bounty). If you are seen feeding on a corpse, you will recive a bounty.
Wolves do not attack you
Werewolf-specific Shouts:
Howl of Terror: the default shout; causes others to flee in fear for 60 seconds
Totem of Brotherhood shout summons two red wolf spirits to aid you in combat for a limited time
Totem of The Hunt is equivalent to a Detect Life spell
Totem of Fear grants a higher-level fear shout