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I didnt realise that the 7mm also had a suppressor.
In that case id still use the 20" 7mm without a suppressor, for ballistic superiority, while keeping the rifle a comparable overall length to the...

The 20" 7mm will do that, and be slightly better ballistically.
It'l probably be shorter or at least comparable in length to a 16" + suppressor as well.

Personally ill take a couple extra inches...

Personally id go with the 20" 7mm-08.

I think the fact that the .308 only has a 16" barrel moves it away from being an-all rounder, and into a slightly more close range/bush gun category.
The 20"...