Leadified on 19 December 2014
I would get the HD Collection because then you get in my opinion the best game in the series which is MGS 3. MGS 3 has quite a variety of environments from narrow buildings to large outdoor sections. It along with Peacewalker should also make more sense of Ground Zeroes' and later Phantom Pain's story.
EDIT: Legacy collection is great too if you can find it for a good price.
