I think this was a topic in the old forum, so I just set it up new.
In my oppinion many small squads are better than a few big squads. Why?
The main advantage is, that you can outnumber your opponent with activations.
This is extremly important in the first turn. If your opponent must reveal important deployment cards
before you, you can shot at his models and he not on yours.
A second advantage is, that you get more support options with more grunts.
A third advantage is, that you may be able to field a real Force Commander.
If you play with Parachuters you have the option to deploy them after your opponent has done its last activation.
But big Squads have advantages, too.
In subsequent turns you have more firepower at the beginning of a turn with a big squad, which is very important, too.
A big Squad can contain more specialist, esp. the Elite Squads.
A big squad does have to make panic roles later than a small squad, because you have to kill more models.
It's your vote.