Logic there is flawed.
1 you can play the PC version on a hd tv using hdmi.
2 graphics look better on the PC version.
3 with a good PC you will actually get to see more on your screen especially the behemoth and Odin fates where a ps3 fails as you don't get to see fate mobs that well on ps3.
4 you can actually customise your ui to make certain things bigger on both the ps3 and PC so if text is too small you can enlarge it.
5 you can use a controller on the PC so no need to use keyboard and mouse to play the game.
6 you can play in full 1080p on a PC with good setup instead of only 720p.
7 the biggest is you can take screenshots in cutscenes on the PC using software like fraps.
On side note ps3 is good if you don't have a fairly good PC to run the game or if you can't afford or have a PC. And yes I have played game on both ps3 and PC.