[Spec sharing time (again!)]

Carnage PvP:

 

http://www.torhead.com/skill-calc#100rcZuGMbddrRrs.1

 

There are a few minor points up for debate, but any good Carn PvP spec will be pretty close to that.

[Annihilation vs Carnage, Pro's and Con's]

Low tier Annihilation is the best for PvE through level 30ish.

 

For low level PvP, low tier Carn is better.

 

At high levels, Carn is better for group PvP and Annihilation is good for solo PvP.

 

They're both fine for PvE as far as people know currently. Annihilation probably has an edge for solo PvE at high levels.

 

 

Carnage is characterized by:

 

1. Heavy burst sequences on a 15s cooldown.

2. Proc damage.

3. Extra roots and CC breaks, and run speed.

 

Annihilation is characterized by:

 

1. Elemental damage (ignores armor).

2. Self heal ticks.

3. Faster/more flexible Force Charge.

4. Pulsing burst on a 7-10 second cooldown.

[What race will your marauder be?]

Human, because there are no elves, dark elves, or half elves.