Your best bet is to pick 2 apposing bases take one switch sides take it back. That can be real challenging especially if the down times are short and the number of troops to capture is high.
When numbers are low, say 4 or less, it's pretty much a dueling arena with different planes. When the numbers are high, lets say over 24, its more of a furball arena. The in-between numbers give you something, well, in-between. The "in-between" numbers cause the most arguments because some want to duel and some want to furball. I would describe it as onesy-twosy fights with threat of interference. When the numbers are over 50 it usually becomes the proverbial cluster-f (this only happens when the MAs go down). It can all be fun.
Just as the quake guys play different games with their engine (deathmatch, capture the flag, defend the fort, whatever), AH is just an engine and many games can be played. You can always take undefended bases in any of 4 arenas where they play the land grab game, but nobody really cares if you take them in the AvA as long as the arena doesn't get screwed up. Who knows maybe some bored guys will up some planes and shoot at ya, never can tell.