A paid faction change is where you pay real money to change your faction to the opposite one. For example, if you have an alliance character, you can pay blizzard to change it to a horde character.
Please note, there are some limitations to this. One of those limitations is, you can not change to a different class, ie. you can not have an Alliance Human Hunter change to a Horde Undead Hunter because the Undead do not have Hunter's (at this time).
When you change factions all of your racial reputation and mounts will be switched as well. Also, any other factions that start from a faction specific person, like the Knights of the Ebon Blade, The Argent Tournament, Sons of Hodir, will all be reset to Neutral and you will have to redo the quests to open up those areas again.
You get to pick another race, from the available options, and customize it.
The Guardians of Hyjal are a new faction that will be appearing in World of Warcraft: Cataclysm. See the related link for more detail.
The best faction is the one you are willing to use. Try both factions and see how you like each. The one you like the most is the one that is the best.
When you pay for the faction change service, all your armor will be converted to its appropriate faction equivalent. The same goes for all your reputation, mounts and all other things. You will need to redo your knights of the ebon blade rep and argent crusade rep as those start with faction specific quests.
The best dancer for each faction would be: Female Blood Elves Male Night Elves
Currently, it is not possible to do class changes in World of Warcaft. You can change your characters race, gender, server and even faction, but you can not change its class. Once a Warrior, always a Warrior, unless you delete it and start over (or level another class).
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The MMORPG World of Warcraft is worth billions of dollars. There are currently over 10 million people with active accounts, plus all of the paid character services like realm transfers, name changes and faction changes.
World of Warcraft is a fun game. You live the life of a fantasy person. You train to lvl 80, get better skills, learn professions. You can pick your race, your faction and your class. the races are a human, night elf, gnome, dwarf, and dranei for the Alliance faction. the races are orc, blood elf, tauren, undead, and troll for the Horde faction. the classes are: warrior, hunter, warlock, death knight, shaman, paladin, mage, priest, and druid. try it and have fun!
Yes you must be Exalted with the Nethwerwing faction found in Shadowmoon valley and have epic flying to attempt to start gaining rep.
the monthly fee is about 15 dollars a month for world of warcraft the expansions dont change that