Played all of the MGS games for the first time in 2017 or so on the PS3. Loved them all, except for MGS V which has probably the best gameplay, but I didn't like the story or characters at all. I didn't like Peace Walker either (it's similar to MGS V). But the rest were GREAT. I don't know if I can pick just one, but MGS 3 is probably my favorite. This series of games is one of those that I know I will play again every few years.