Which ultrabook should i buy?

Lenovo Thinkpad X1 Carbon
-Intel Core i7-5600U(3GHz, 4MB)
-14in(1920x1080 pixels)
-Intel HD graphics 5500 8gb
-8gb DDR3
-128gb SSD
-1-year warranty
-139,860yen or $1133

Lenovo Yoga 3 Pro
-Intel Core M-5Y70( 1.10GHz 1600MHz 4MB)
-13.3" QHD (3200x1800) LED Backlight, Multitouch
-8.0GB DDR3L 1600 MHz
-256GB SSD
-1-year warranty
-144,396yen or $1170

Dell XPS 13(Non-touch)
-Intel Core™ i5-5200U
-13.3in FHD (1920 x 1080)
-8GB DDR3L-RS 1600Mhz
-128GB SSD
-1-year warranty
-with Office Personal 2013
-139,980yen or $1134

-Main purpose is Android App Development
-light gaming(just to waste some free time)
-I live in Japan so prices are different than in US
-Please do suggest other options

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