The way I see it is Hasbro stated they wanted a common history/backstory for Transformers.

War for Cybertron's basics (Megatron founds the Decepticons, starts a war, kills the Autobot leader, Optimus is made the new leader, Cybertron becomes unihabitable so the Transformers leave) aren't really anything new at all, but it made for a good game and an alright novel.

The "origin" is the same that seen in most Western fictional TF universe. The G1 cartoon, the G1 comics (Marvel, Dreamwave and IDW), Cybertron, the live action movies and now Prime, all share these elements and I expect (if Hasbro stick to this) any future series would too.

So the way I see it any of the series could use War for Cybertron as a version of what happened before they came to Earth. If you're a G1 fan its G1. If you prefer the movies it's the Bay-verse.

The only Western series where this origin doesn't fit are RID (which is perhaps cross-universal), Armada/Energon, and Animated.

I don't agree that WFC is explicitly in the Prime continuity to the exclusion of the others (which seems to be how TFwiki is treating it.) I think WFC is a much more multiversal hub, but I can understand why the wiki is treating it that way to make it less complicated to order things.