Beast Mastery spec will greatly increase your pet damage and survivability making them a better tank for you and also be able a lot of the damage for you. This is our recommended spec for beginners, as you will have a higher survival rate from the protection of your pet. However total damage output is a bit lower over other spec and your kill rate will be slower which could lead to slightly slower leveling.
High Survivability: Your pet will make a great tank for you and their added damage will help the pet ability to hold agro.
Marksmanship is the fastest leveling spec for advanced players, your Hunter will do very high damage in short burst which is ideal for grinding monsters, 2 key talents that will help the most in the Marksmanship tree are Rapid Killing at level 10 and Rapid Recuperation at level 51.
Highest DPS Spec For Leveling: The burst damage that Marksmanship can provide will set you on a killing spree with very little downtime.
Low Downtime : Rapid Killing at level 10 and Rapid Recuperation at level 51 and Chimera Shot healing ability at level 69 is extremely useful to reduce your downtime while you grind through Outland and Northrend content.
The Hunter Suvival spec is a talent tree that focus a lot of damage over time (DOT) which makes it inefficient for leveling as your damage is too spread out over a set amount of time. The talent tree is also awkward to use for early leveling for example you can get Entrapment or Point of No Escape at level 17 but you won’t be able to get Ice Trap or Snake Trap until level 46 or 48 which makes the talent useless for over 25 levels.. very inefficient for leveling.
It will be a great spec for end game Raiding and PVP but I would recommend you stay away from it for leveling.