I have that exact same question when I tried out the PS3 beta.. I've decided to try out the PC beta also.. the conclusion I've come up with is easily Pc version is better by far(I'm using an AMDFX8350 & HD7850) the keyboard layout is easier to use for these MMORPG that have so many spells to use.

Also PS3 DS3 cannot type fast. Attaching a keyboard to PS3 also difficult to use because it's on floor setup compared to PC on desk setup.