I think it was discussed a looooong time ago that most developers are more experienced on the 360 while the Cells architecture is a big mess... so who cares ? MGS4 is arguably the best looking game on any console, so if Konami could pull it off any other developer should be, that is if they want to be taken seriously from PS3 owners...

actually why do u need a complicated developing environment, if the end products are not significantly better than the opponent's console? i only hope there is really still alot of untapped power in ps3, then making it hard to develop for seems more worthwhile

Superior because it's easy to developer for. Carmack is used to a PC-like architecture, thus he favors the 360. He's also mentioned how much he prefers the 360's dev tools.

Some past comments of his on the matter:

PS3Vault:

Those willing to put some extra love into ps3 development, like Naughty Dog and Guerrilla Games, will have great results. 

And as other developers get to know the ps3's architecture over the course of the generation, it won't require an extra 20% more effort or anything of the sort to get that extra "oomph" out of the hardware.  You have to figure, developers will be working with the ps3 for at LEAST the next 4 years, and over that time they'll learn the ins and outs of the system.

One of the biggest hurdles for Playstation 3 is multicore architecture. Which incidentally is the future. Expect the next Xbox to use a multicore architecture as well. The same headaches and pains the PS3 has, will be on the next gen of consoles. The PS3 for all intents and purposes for its hardships, is still, forward thinking.

Of course 360 is superior for developers ,,,it's really similar to PC,,,,,no denying tht

You are absolutely correct.

Mirror's Edge also uses a propetiary lighting engine from Liquidlight.  It is a revolutionary engine that looks to make a jump in fidelity in real world lighting and shadows. 

I want to stress this as much as possible: The "myth" that the PS3 cannot do Unreal Engine properly is just that, a myth. With the proper programmers, the platform can see some incredible advantages.

EA has been one of those developer's that has dedicated its resources in PS3 research and are quickly becoming a premiere developer on the console.  I am shocked at the strides EA has made these last few years.  

I don't want to come off biased though.  I think for all intents and purposes, currently, the Xbox 360 represents an amazing value that has never been seen in videogaming.  I do believe the PS3 to be the superior hardware, and not just marginally.  However, I will say this- the Xbox 360 has brought the best out of both the Wii and the PS3.  That is no understatement.

The 360 uses a multicore architecture as well.  It's just 3 symmeric CPUs vs a PPU and several SPEs

Of course, PCs are already using 4 cores.

This is true, but I figure developer's will have a real pain in the ass once they realize they can't shortcut their way around.  The PS3 was developed for the graphic card and the cell to be used together.  Unfortunately, most devs just use the graphic card.

I think the issue with UE3 is similar to Silicon Knights' issues with the engine.  Notice that developers didn't start using UE3 on the ps3 effectively until after UTIII came out?  If I had to venture a guess, I'd say that Epic was withholding major updates to the engine from licensees until after their own title had been released, instead of handing them out during development as they were implemented into their own version of the engine, much like what SK accused them of doing with Gears on the 360.