Asus Zenbook Prime UX31A vs HP Envy Spectre XT 13-2050nr vs Samsung Series 9 NP900X3C;Who is your favourite?

W.A.Khan,                                                                                                                                                  2/5/2013,                                                                                                                                                                                                  Asus Zenbook Prime UX31A                                                                                                                                                                                                Asus essentially maintains performance parity with the similarly priced Acer Aspire S5, but includes a better display.
The Asus Zenbook Prime UX31A is a premium computer with a price tag to match. The build quality is excellent, the performance is great for an Ultrabook and the screen is top-notch.
Sadly, the battery life makes you think twice about its good points when you're spending that amount of money - we're just not sure that it's worth it for all that many people.
If you want a high-end Ultrabook, we recommend the Asus Zenbook Prime UX31A as long as battery life isn't your main concern.   Specifications
Processor3rd Gen Core i7Intel i7-3517U / 1.9 GHz ( Dual-Core )
Memory4 GB
Hard Drive256 GB - Serial ATA-600
Operating SystemWindows 8 64-bit Edition
Display Type13.3 in IPS
Max Resolution1920 x 1080 ( Full HD )
Graphics ProcessorIntel HD Graphics 4000
Optical DriveNone                                                                                                                                                                                          Price;$1,299.00 - $1,671.99
VS                                                                                                                                                                                                                               HP Envy Spectre XT 13-2050nr                                                                                                                                                            Slim and lightweight, the HP Envy Spectre XT is portable, well-built, and easy to use, with a great keyboard.
But, The design doesn't stand out as much as the original Spectre's did, and its battery life won't get you through an entire day. From a premium product, we'd expect a higher screen resolution.
The bottom line: A high-end laptop at a mainstream price, the HP Envy Spectre XT gets much of the look and feel right, with only a few missteps.
System configurations:                                                                                                                                                            Windows 7 Home Premium (64-bit) w/ SP1; 1.7GHz Intel Core i5-3317U; 4GB DDR3 SDRAM 1,600MHz; 64MB (Dedicated) Intel HD 4000; 128GB Samsung SSD                                                                                                                                                       Specifications
ProcessorIntel 3rd Gen Core i3
Memory4 GB
Hard Drive128 GB
Operating SystemMicrosoft Windows 7 Home Premium
Display Type13.3 in
Weight3.07 lbs                                                                                                                                                                     Price;$1,199.99                                                                                                                                                                              VS                                                                                                                                                                                             Samsung Series 9 NP900X3C (13-inch, 2012)                                                                                                                                  A thin, stylish design, long battery life, excellent screen, and a new second-generation Intel Core i5 CPU make the Samsung Series 9 NP900X3A one of the best ultrathin Windows laptops we've ever seen.
But, The Series 9's way-too-high sticker price makes the MacBook Air look downright affordable by comparison; the flexy case design doesn't feel as good as the MacBook Air's, either.
The bottom line: The $1,649 Samsung Series 9 NP900X3A certainly won't be for every wallet, but this light, well-featured, and striking 13-incher is the closest the Windows world will ever come to a MacBook Air. However, its higher-than-the-Air price will be hard to stomach.                                                                      
System configurations:                                                                                                                                                            Windows 7 Home Premium (64-bit) w/ SP1; 1.7GHz Intel Core i5-3317U; 4GB DDR3 SDRAM 1,333MHz; 64MB (Dedicated) Intel HD 4000; 128GB SanDisk SSD                                                                                                                                                    Specifications
ProcessorIntel 2nd Gen Core i5 i5-2537M / 1.4 GHz ( 2.3 GHz ) ( Dual-Core )
Memory4.0 GB / 8.0 GB (max)
Hard Drive128.0 GB
Operating SystemMicrosoft Windows 7 Home Premium 64-bit Edition
Display Type13.3 in TFT active matrix
Max Resolution1366 x 768 ( HD )
Graphics ProcessorIntel HD Graphics 3000 Dynamic Video Memory Technology
Optical DriveNone                                                                                                                                                                         Price;$1,699 / $1,649