>>96505949
Squads of 5 are likely the best way to take them. They fit into a LR nice and snug with space for an attached character or two, they're tough enough that you need dedicated anti-termie firepower to take them down which might result in ineficcient overkill, you get better bang for your buck thanks to the sergeants, they're easier to move aorund the table, you avoid buying a Spartan, etc.