I personally would go with the termies, as I find scouts incredibly lacklustre, but on the other hand they do need proper support. If you have some other DS units, like podding marines/dread or ASM, then go for it, but if you leave them on their own, they will die. It really depends on the list. If you are already playing an aggressive list with lots of DS, then go termies, if you are light on AA or troops, go scouts.
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