OK, Laptop Screens, sizes, Resolution and aspct Ratios
Laptops come in Screen Size, eg 14", 15.4", 17" being the main ones (yes, there are many others). The screen is measured diagonally. Some Laptops have different Aspect Ratios. In your case, the 1200x1050 is a very square laptop, whereas the 1440x900 is the standard (widescreen) laptop.
On top of this, seperate, you can opt for a higher resolution (in pixels) screen. I am about to get a 1920x1200 instead of the standard 1440x900 as the resolution for everything will be better. However, this does not, in any way, affect the screen size.
Note of course, many programs these days are designed for the wide screen. I find editing on a square screen (like the 1200x1050 will be) annoying as in Photoshop, I run all the menus down the side. I end up with a working area that is very narrow. Hence, I prefer the widescreen.
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