13" macbook pro or DELL Inspiron 15R for gaming?

Macbook Pro with Intel GM 3000 chip for gaming....are your serious man. This chip is not meant for serious gaming and serious designing tools. Geforce GT 525 is more advanced and better than Intel GM controller. Also, Macbook are not meant for gaming. You wont find any good gaming titles for MAC OS X. So, my advice, stick to Windows based laptop with a dedicated graphic card if you wanted some serious gaming. And dont forget to purchase a seperate USB mouse and keyboard for gaming. Laptop keyboards are not build for serious gamers. They wont last long if you play using laptop keyboard. You can also look for other options for laptops like of Asus, MSI or HP. But whatever you choose...dont miss Intel Sandybridge chipset(their 2nd Gen i-core processor), DDR3 RAM and a dedicated graphic card of either Nvidia or ATI/AMD.

For an onboard processor, GeForce is really powerful. Its 90+ processing cores, fast core and memory clock, DDR3 memory and DirectX11 support are all great features. This card offers more than 1/2 of the performance I get from my GTS450 FTW. And that's saying a lot for a microprocessor opposed to a bulky card. Personally, I'd stay away from Intel. nVidia is just king when it comes to graphics. Intel does some things really well, but there's a reason that the vast majority of those purchasing standalone graphics cards go for nVidia even more than ATI. nVidia's graphics solutions are also customizable to no end, and they're always tweaking and releasing drivers to improve performance. But I'm approaching this from a gaming standpoint. nVidia holds up better for gaming and probably always will. That's their schtick.

as regards graphics or editing i think having a dedicated video card that enables dedicated memory for graphics and so compatible with all advanced graphic standard is much better than a shared one as intel graphic hd till now!!This can be true for gaming for example but also for heavy editing video/photo or even graphic developing...normally the shared intel graphic is ok just for normal things or softwares but if you need a graphic power to run complex softwares so the intel graphic will result a little bit entry level!!

Always go for NVIDIA Graphics it give you the more flexibility for your computer especially for high end users like you. My suggestion don't go for Intel HD my friend bought the same Intel HD Graphics Dell laptop, now he's struggling by slower performance of graphics. So don't go for Intel HD