Acer Aspire S7 vs Lenovo IdeaPad Yoga 13 vs Asus Taichi 21:Who is the best?

W.A.Khan,                                                                                                                                                                                                                                                                                                               Acer Aspire S7                                                                                                                                       The Acer Aspire S7 is a premium-looking ultrabook, with great performance, strong battery life, and a high-res touch screen.
But, The expensive S7 is priced well beyond most other touch-screen Windows 8 laptops. The touch pad is not as responsive as it should be.
The bottom line: One of the few standout products from the first wave of Windows 8 laptops, the Acer Aspire S7 proves that Apple does not have a monopoly on great design.                                                       Specifications
ProcessorIntel 3rd Gen Core i7 3517UB1.9 GHz ( 3 GHz ) ( Dual-Core )
Memory4 GB/ 4 GB (max)
Hard Drive256 GB
Operating SystemMicrosoft Windows 8
Display Type13.3 in
Max Resolution1920 x 1080 ( Full HD )
Graphics ProcessorIntel HD Graphics 4000
Optical DriveNone                                                                                                                                    Price;$1,560.01                                                                                                                                        VS                                                                                                                                                           Lenovo IdeaPad Yoga 13                                                                                                                        The Lenovo IdeaPad Yoga 13 looks as good as any 13-inch ultrabook, with the added attraction of a 360-degree screen and a laptop body that can fold into a tent, stand, or slate.
But, Tablet mode leaves the keyboard exposed, and the Yoga 13 costs more than standard ultrabooks with similar components.
The bottom line: The Lenovo IdeaPad Yoga 13 is a convertible touch-screen laptop/tablet that most importantly doesn't compromise the traditional laptop experience.                                                               Specifications
ProcessorIntel 3rd Gen Core i5i5-3317U / 1.7 GHz ( 2.6 GHz ) ( Dual-Core )
Memory8 GB / 8 GB (max)
Hard Drive128 GB - Serial ATA-300
Operating SystemMicrosoft Windows 8
Display Type13.3 inIPS
Max Resolution1600 x 900 ( HD+ )
Graphics ProcessorIntel HD Graphics 4000
Optical DriveNone                                                                                                                                    Price;$989.99 to $1,199.99                                                                                                                     VS                                                                                                                                                         Asus Taichi 21                                                                                                                                             The Asus Taichi 21 offers a clever implementation of a dual-screen design in a slim Core i7 chassis.
But, Only one of the screens is touch-enabled, which feels like a major oversight. There are probably only a handful of situations where you'd need an outward-facing display.
The bottom line: More of a clever proof-of-concept than a practical product, the Asus Taichi still delivers on its basic promise, combining two displays for a unique take on the laptop/tablet/hybrid genre.                       Specifications
ProcessorIntel 3rd Gen Core i7 3517U / 1.9 GHz( Dual-Core )
Memory4 GB
Hard Drive256 GB- Serial ATA-600
Operating SystemMicrosoft Windows 8
Display Type11.6 inIPS
Max Resolution1920 x 1080 ( Full HD )
Graphics ProcessorIntel HD Graphics 4000
Optical DriveNone                                                                                                                                    Price;$1,489.00 to $1,599.00