|Photo courtesy of Faid of Nerf Faids|
There are 2 choices when it comes to picking your Engineering Specialization, Goblin or Gnomish Engineering. Goblin Engineering focuses on bombs and rockets, while Gnomish Engineering focus on crafting trinkets and devices. Which one you choose is up to personal preference and there isn't much to gain from choosing one specialty over the other. Each profession does have some specialization specific recipes, most notably the ability to craft 1 of the 2 new Engineering Profession crafted companion pets.
Engineering Crafted Companion Pets
Each type of engineer has a new Cataclysm recipe for crafting a companion pet.
Goblin Engineers can craft the Personal World Destroyer companion pet.
Gnomish Engineers can craft the De-Weaponized Mechanical Companion pet.
Why limit yourself to profiting on crafting only one of these vanity pets? You can actually learn both recipes and craft both the goblin and the gnomish companion pets.
Swapping Engineering Specs
In Bootlegger Outpost in Northern Tanaris resides an npc named Narain Soothfancy. Inside her hut is a book titled "Soothsaying For Dummies". Is is this book that you open to be able to swap to the other engineering specialty for a fee of 150g. Once we changed your Engineering specialization, you can go to a goblin or gnomish Engineering trainer and learn the recipes of the other specialization. Visit Narain's hut again to swap back to the original specialization if you like, but it will cost you another 150g. To most of us 150g is petty change and is well worth the ability to craft and produce both of the great selling companion pets available to only us Engineers. Remember you need to be the correct spec in order to use the spec-required items like the transporters.