MGS kept bringing me back for more. Splinter Cell had more "try try again" style of gameplay. I found myself getting into, and out of, exciting situations in MGS far more than any of the Splinter Cell titles -- in SC, I just was really steathy (which was the fun part of SC), or I was dead and had to try again. No escaping if you screwed up, for the most part. MGS had both the stealth and the thrill of "oops" without having to constantly reload from the last checkpoint.
MGS was more fun. ...and the story was less generic, and thus, better.
Splinter Cell is still one of my favorite game series, though.







