Before choosing any profession, it may help to have a look below at the different bonuses, perks, or benefits that the profession will provide. This can help you make a sound decision on which will help your character the most. All in all though the bonuses themselves will be very comparable. Instead, you may want to focus on the way each bonus is given or if the profession offers some sort of perk that can save you a lot of gold or time. Alchemy is a good example. If you are spec'd in a certain discipline like potions and your a raided who uses potions a lot, you may save some consider amount of gold from the procs. You'll also be able to make an iLvl359 trinket fairly cheap and easily. On top of that you'll get a flask that is NOT consumable which can be perfect for a farming or daily questing type player. In short, think about what you do in the game and consider which profession will benefit your character or characters the most.

Alchemy

• [Lifebound Alchemist Stone] - Stamina
• [Quicksilver Alchemist Stone] - Agility
• [Vibrant Alchemist Stone] - Intellect
• [Volatile Alchemist Stone] - Strength
• [Mixology]
• [Flask of Enhancement]: +80 Agility, Strength, or Intellect

Blacksmithing

• [Socket Bracer]: +40 Agility, Strength, Intellect, or 60 Stamina with a rare gem OR +50 Agil/Str/Int or +75 Stam with epic gems
• [Socket Gloves]: +40 Agility, Strength, Intellect, or 60 Stamina with a rare gem OR +50 Agil/Str/Int or +75 Stam with epic gems
• This totals +80 Agil/Str/Int or +120 Stam for rare gems and +100 Agil/Str/Int or +150 Stam for epic gems making it the best profession stat wise when you use epic gems.

Enchanting

• [Enchant Ring - Agility]: +80 Agility
• [Enchant Ring - Strength]: +80 Strength
• [Enchant Ring - Intellect]: +80 Intellect
• [Enchant Ring - Greater Stamina]: +120 Stamina

Engineering

• [Agile Bio-Optic Killshades]
• [Camouflage Bio-Optic Killshades]
• [Deadly Bio-Optic Killshades]
• [Energized Bio-Optic Killshades]
• [Lightweight Bio-Optic Killshades]
• [Reinforced Bio-Optic Killshades]
• [Specialized Bio-Optic Killshades]

The above helms have special sockets that use Cogwheels only usable to engineers. Click for Cogwheel list.

• [Grounded Plasma Shield]
• [Quickflip Deflection Plates]
• [Spinal Healing Injector]
• [Synapse Springs]
• [Tazik Shocker]
• [Z50 Mana Gulper]

Inscription

• [Swiftsteel Inscription]: +130 Agility (+80 Agility more than normal) & +25 Mastery Ratoms
• [Lionsmane Inscription ]: +130 Strength (+80 Strength more than normal) & +25 Critical Strike
• [Felfire Inscription]: +130 Intellect (+80 Intellect more than normal) +25 Haste
• [Inscription of the Earth Prince ]: +195 Stamina (+120 Stamina more than normal) & +25 Dodge

Jewelcrafting

• Jewelcrafting only gem - [Chimera's Eye]: +27 stats or +41 stamina more than regular gems. Limited to 3 which equals +81 stats or +123 stamina when compared to rare gems OR +51 stats or +78 stamina when compared to epic gems.

Leatherworking

• [Draconic Embossment - Agility]: +130 Agility (+80 more than normal)
• [Draconic Embossment - Strength]: +130 Strength (+80 more than normal)
• [Draconic Embossment - Intellect]: +130 Intellect (+80 more than normal)
• [Draconic Embossment - Stamina ]: +195 Stamina (+155 more than normal)

Tailoring

• [Lightweave Embroidery]: +580 Spell power for 15 seconds.
• [Darkglow Embroidery]: Restores +800 mana.
• [Swordguard Embroidery]: +800 Attack power for 15 seconds.

Herbalism

• [Lifeblood]: +480 haste for 20 seconds (2 minute cooldown).

Mining

• [Toughness]: +120 Stamina.

Skinning

• [Master of Anatomy]: +80 Critical strike.