I tamed BOTH Washte Pawne and Azzere the Skyblade to see which was better.  Disappointing that Azzere's fearce fire attack is not a tameable ability, cuz it does tons of damage.  I leveled up the two to 29 and trained Azzere with Washte Pawne's Lightning Breath.  Even with Lightning Breath trained to Azzere, he still doesn't seem to be quite as good an overall pet as Washte Pawne.  Azzere is better looking with his deep red color and does slightly more damage, but Washte Pawne holds up better in tough battles.  At least that's been my experience.

Here are the stats of these two rare wind serpents at level 29:

Washte Pawne: Strength-60, Agility-50, Stamina 149, Intellect 24, Spirit-41, Power-135, Damage-45-55, Armor-2030

Azzere: Stength-57, Agility-44, Stamina-142, Intellect-51, Spirit-49, Power-129, Damage-53-65, Armor-1788

As you can see, Azzere has much high Intellect than Washte Pawne, but Pawne has higher Stamina and Armor.  I'm not experienced enough at playing the Hunter char to know if Intellect is very helpful to pets.  What does Intellect even do for pets anyway?

Hope this helps.  If you decide to get Azzere you really should also tame Washte Pawne just to get Lightning Breath and train it to Azzere as I did.  A wind serpent with Rank 3 Lightning Breath is hands down the best pet for level 25-40, in my experience.