[SG] multi-player SG question

I'm running a game with four attacking players and three defending
players.  
Each player will have one platoon of three squads each.  I was assuming
that 
each time a side gets its turn each player on that side can activate one

unit, but this always gives the attacker four activations to the
defenders 
three.	Would it be better to limit the attacker to three activations a
turn, 
and have the attacking commander choose which three attacking players
get an 
activation?
Thanks,
Jed