Ray Wonder
Founder of the Wounded Tagless Children
They are pretty different. Witcher's world is amazingly complex with NPCs, MGS doesn't have that. MGS takes the cake in gameplay options though, it is so fluid in how it can transition from stealth to action depending on how you go about the tasks.
Hope it works for you.
Hmmm. Ok. I'm going to grab this either way, but I just haven't been able to make time to play anything and The Witcher 3 is the only game I've been able to play more than 40 hours in in the past 4-5 years.