I own both consoles and I will likely buy the 360 version for the following reasons:

1) High quality 1080i upscaling. 720p does not look good on my 1080i native TV. The PS3 version *may* support high quality upscaling through software, but many PS3 games only support low quality upscaling, while others don't support upscaling at all.

2) Rumble support. Again this *may* be supported by the PS3 version, but then again it may not.

3) No sixaxis nonsense.

4) The 360 version will likely look/perform a little better. PC based cross-platform titles always do, and I see no reason why this game would be any different.

Though I may reconsider if I have to swap discs while backtracking, like in Star Ocean 4.

To the person that doesn't care about trophies and achievements, they are the same thing.  To the person that does, well, they're still pretty much the same thing, but I still prefer achievements.

Why do I like achievements more?

1. I would rather have 7000 points than be level 3
2. Trophies are confusing -- what the fuck does level 3 mean and how do I get there? 
   
3. I have a better idea of a person by looking at someone's gamerscore.

Anyone can argue those points but whatever, those are my reasons and I don't really give a crap about your opinions.

Although I love multiple disks (IDK why...nostalgia perhaps?), I'll still get the PS3 version.
I won't buy a 360 just to play FFXIII on multiple disks.
After all is said and done, I can see the PS3 version selling better than the X360 version; mainly due to the Japan effect, but largely due to what I see in games such as RE5 in Others where the franchise is historically established (FFVII-FFXII + PSP ports and games)on the Playstation.

Just like Halo 3, right? Lol, and the PS3 is so quiet that you can't even hear anything. How can you run quieter than that?

 Why does it matter if they are opinion? The OP was asking for the reasoning of individuals. That is naturally going to be based on opinion.

Even if i had a PS3 i'd get the 360 version for achievements, unless the 360 version was gimmped in some way.

If I had PS3, I would buy this for 360.

I reckon he's been too busy trolling it to have seen one.

I really don't see any need for another discussion like this. 99% of the people have only one of the consoles anyway and until one of the two versions has confirmed quality issues there's no reason whatsoever to choose one over another.

I always have to chuckle when Sony fans, who often (rightfully so) claim FFVII to be one of the best games ever, complain about disc swapping.

Of course I like them more did you not even read what I wrote. As I've said trophies do nothing for me. Oh and whats this shit I paid for I only pay for what is worth my money in my own opinion if you don't like xbox 360 wii or playstation 3 whichever you meant as being shit I paid for then thats your own loss.