When I login to arena caps, I look and see how far the split is. I notice normally once it's at about 85% occupancy of the other arena, they both open up (2-5 minute wait usually). Not a huge deal, and if the arenas are that evenly split, it's normally a crapshoot to find out which arena has more even numbers and fight and better map.
Now, when I login at 8AM-10AM PST, this is what I see... Orange has 140 players, Blue has 20 players, both arenas are open. I go into Orange due to the more numbers = better fight philosophy and without doubt there is a HUGE misbalance of players somewhere in the arena. Normally 2 sides will have 20-30 players, and then one side will be 60-80 players rolling the map and no decent fights going on anywhere. Normally ENY sucks if you're unlucky enough to be on the side stacked against, and its frustrating to even find a fight, let alone a good one.
So I go to Blue. Yeah there's only 20 players, but normally there's better fights going on, and within 2 to 3 hours, you end up with a pretty populated arena with usually ballanced sides that ends up being a better fight. Then #'s drop, you get bored, and go back into Orange and to a hugely unbalanced map and roster.
As to flying with the squads, it's simple, fly blue for squad events. 2 of the last 3 squads I've flown with fly almost strictly blue to avoid arena cap problems unless it's early in the morning.