Personally, I would go for an MG36
it has the same length as the normal G36, HUGE mag and accepts the same G36 mags as the other types.
then there is the added bonus of the built in Bipod. i know of quite a few occasions in woodland when I could have used a Bipod to good effect.
Plus, you will be hard pushed to find a proper G36 rather than a K
G36 also known as the G36E -> Rifle version ->woodland
G36K ->Carbine version -> mixed
G36C ->Compact version ->CQB can be used relativly effectivly in woodland