They both show off the advantages of having a larger storage medium by bluring the line between cut scene and gameplay.
I remeber when FF7 came out. At the time I was a raging Nintendo fanboy. I hated Square for thier betrayal of Nintendo and I said I didn't care about about cut scenes (FMV). But after playing FF7 and all it's glory I knew in my heart that FF7 could never have been done on N64. Not in the masterful way it was done on Playstation. I knew then that being the owner of a console with a low storage medium can leave you feeling empty. I bought a PS3 because I never wanted to feel that way again.
Fast forward to yesterday. I invited a friend over so he could see MGS4. He had just spent $3000 on a gaming PC and Crysis a month ago. Remembering some of the arguments I'd had here on VG charts, I asked him: "So does this look better then Crysis?", To which he replied "well a little but that's just the cut scene". Then as the actual game began Solid Snake stood motionless. I asked my friend why he wasn't moving.
The game had gone from cut scene into gameplay and he hadn't even noticed.
So that's the advantage of PS3 that even most PC games can't touch. A ridiculious ammount of memory allowing developers a LOT of real estate to work with. MGS4 is the first game to take advatage of this... but it wont be the last.
Naysayers will mutter somthing along the lines of: "I don't mind having a game on multiple DVDs"
To which I will say: "what will you do for the game comming out on multiple bluray disks?"
To which they will say: "I'm Lvl 70 in WoW".
Good for you kid. As for me I'll be chillin' with Final Fantasy 13.
