What is your favorite style of multiplayer? Shooter/Action adventure?

Now i mean like this.

1. Weapons on map: Quake, Halo, GTA 4 etc.

2. Role based: Battlefield, Team Fortress,

3. Just choose weapon: Medal of honor allied assault, resistance 2

4. Buy/money: CS and i think others

5. Custom load out: Rainbow six Vegas 1&2, Call of duty 4, and others cause they all want to be the same

So what is your favorite, also how could you add the 6th if you even can?