The Grunts didn't have warships or gunships during the rebellion, though.
In a pure infantry battle, it could probably go either way. The Fallen are a pretty brutal species. On the other hand, the Grunts during the rebellion proved themselves as a worthy challenge for even the Elites.
It really depends on the context of the fight. However, I believe that the Fallen would win in most scenarios. Not without significant losses, though.
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Of corse but we must include the ghost wether they had them or not