Steeltrap said:
So my buddy and I were debating who would win in a all out war. Who would win in a galactic war all the Imperial Guard or all of the Space Marines?
Depends on which version of each you're using.
If the forces involved are as depicted by Our Spiritual Liege, then the Space Marines would win easily, with absolutely no fatalities, since the single casualty would be interred in a Dreadnaught.
If we're using the Caiaphas Cain or Gaunt's Ghosts novels as base however (read: something moderately "realistic"), then it'd likely go to the Guard.
Believe it or not, the Imperial Guard is
the single most effective military force in the 40k galaxy. Each individual guardsman is kinda pathetic in the grand scheme of things, but there's trillions upon trillions of them, with the logistical infrastructure to match. They can and will kill anything and everything in the galaxy in a straight 1v1 fight, over a long enough period of time.
Glademaster said:
Well they essentially are(minus any augmentations) but do a vastly specialised and different job. While the Marines are just a general kill shit and the SoB can be this too they tend to be a lot more used against Chaos.
Yes and no. The Sisters of Battle were originally conceived as the Ecclesiarchy's answer to a restriction that banned them from employing "men at arms". The short version is that one of the High Lords of Terra dicked over the entire Imperium and nobody wanted to see it happen again, so they banned the Ecclesiarchy from having a military force. They got around the ban by hiring women instead.
As part of being a member of the Ecclesiarchy (read: The Church), the Adepta Sororitas primary function is to suppress/find/destroy heretics. As a consequence, they almost exclusively are used against Chaos worshipers. They rarely, if ever, intentionally see battle against any of the Xenos.
They're also a
lot less effective than Spehss Mehreenz, due to the lack of augmentations. They get power armor of a similar level, but that's about it.