F2P pros, its free. cons you have to earn everything by yourself, no ah or trading, 10g cap,
24 pros, 4 levels better enchants and armor, you can use the ah instead of farming everything yourself. cons, no real cons except all the flaming you get for playing top of the bracket.
I love playing with 24s, although it is a pain when 90% of the time i que for wsg i have to duke it out with 3+ 24s on horde xD....
in my opinion, if it weren't for the 24s that play objectively the horde wouldn't have a chance and they would be constantly shut down and gy camped for 20 minutes by the 8 alliance nelf hunters rocking their skillpatches and intellect gear