Don't worry about the Harry Potter reference, Captain is just calling us Slytherin because we beat them and our insults are better
![wink wink](/forum/images/graemlins/default_dark/wink.gif)
Truthfully all the alliances have skilled players who have had champions and number 1 fighters in their camps to help you out.
Alliance rosters under reference will tell you what players and camps are part of each alliance -
http://www.mmarmy.com/forum/ubbthreads.php?ubb=showflat&Number=362592#Post362592Alliance competition event scores are totalled for a prize to the winner at year end, and each group runs their own internal events and discussions as well.
An alliance does add a lot to the experience of the game for most. You get in on more discussions of strategy and events and kind of gives you a team to play for and root for. All alliances have some clothing in game as well.