The WOW pvp system awards time and not skill, so if you don’t have 12 hours a day for PVP’ing, going for exalted with one of the factions in the battlegrounds, will most likely get you better results gear-wise. The advantage of going for exalted with the BG factions is that your reputation gains aren’t reliant on others, as it is with the PVP system, so you can gain rep when you want and it doesn’t decay.
There are 3 battlegrounds; Alterac Valley (AV), Arathi Basin (AB) and Warsong Gulch (WG).
Alterac Valley
Alliance gains reputation with the Stormpikes and Horde gain reputation with the Frostwolves. The most interesting rewards are at exalted (of course 
). Reputation gains are as follows (from WOWwiki.com):
Quote: Note that in Alterac Valley all reputation with Stormpike/Frostwolves is shared amoungst all combatants, whether or not they are partied with you or not. However some turns in will give reputation with one of the 4 main primary factions. This faction is not shared.
Stormpike/Frostwolf reputation is gained in the following ways:
Killing the enemy General (300 rep)
Killing the enemy Captain (125 rep)
Killing an enemy Lieutenant or Commander (12 rep)
Killing an enemy Wind Rider (5 rep)
Killing any Enemy Guard (5 rep) *NOTE: This is capped through honored like Argent Dawn, doesn’t give rep in exalted*
Killing an enemy player (1 rep), IF you are in the enemy player’s threat list. This means that you must have damaged the enemy, buffed or healed a player that damaged the enemy, or debuffed the enemy.
Killing Ivus the Forest Lord or Lok’holar (125 rep)
Destroying an enemy tower (12 rep)
1-time quests (first turnin of each repeatable, capture a tower/mine/graveyard, etc) (~100 rep each, varies)
Repeatable reputation quests
Ram hide/frostwolf hide (2 rep)
Bringing a ram/frostwolf to your stable (1 rep)
Armor Scraps (1 rep for 20 + 10 Ironforge/Orgrimmar for the character)
Storm Crystals/Stormpike Blood (1 rep for 1, 5 rep for 5 + 50 Ironforge/Orgrimmar for the character)
Wind Riders
Sildore/Guse (1 rep)
Vipore/Jeztor (2 rep)
Ichman/Mulverik (5 rep)
At the end of the game, extra rep is gained for each of the following conditions:
Enemy Captain killed (36 rep)
Your Captain is still alive (125 rep)
Enemy tower destroyed (24 rep each)
Enemy Lieutenant/Commander killed (12 rep each)
Controlling an intact tower (12 rep each)
Controlling a graveyard (12 rep each)
Controlling a mine (12 rep each)
The exalted, epic rewards are:
Offhand items:
Arcane tome: +34 arcane damage, 3 MP5
Fire tome: +40 fire damage
Shadow tome: +8 STAM, +34 shadow damage
Ice tome: +9 INT, +34 frost damage
Lei of the lifegiver: +53 healing, 3 MP5
Therazane’s Touch: +33 damage/healing
Weapons:
The unstoppable Force (TUF): 175-292 dam, 3.8 s (61.4 DPS). +19 STR, +15 STAM, +2% crit, proc: Stuns target for 1 sec.
The lobotomizer: 59-111 dam, 1.8 s (47.2 DPS). Proc: Wounds target for 200 to 300 damage and lowers Intellect of target by 25 for 30 sec.
Shield:
The immovable object: 2468 Armor, 44 Block. +15 STAM, equip: Increases the block value of your shield by 27.
Rings:
Don Julio’s band (unique): +11 STAM. Equip: Improves your chance to get a critical strike by 1%. Improves your chance to hit by 1%. +16 Attack power.
Don Rodrigo’s Band (unique. Priest, mage, warlock only): +7 STAM. Equip: Improves your chance to get a critical strike with spells by 1%. Decreases the magical resistances of your spell targets by 20.
Mounts:
Horde: Horn of the Frostwolf Howler. Very fast wolf.
Alliance: Stormpike Battlecharger. Very fast ram.
Apart from the exalted rewards there are also lower reputation rewards, but seeing as most people only care about exalted rewards, I decided to focus on those 
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