For $999 should I buy the Microsoft Surface Pro or the Apple Macbook Air 11"?

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Similar features: CPU: Intel i5 3rd generation, Graphics: Intel 4000, RAM: 4GB, Wi-Fi (802.11a/b/g/n), Bluetooth 4.0, 720p front camera, USB 3.0, (Surface Pro vs Macbook Air 11-inch) Battery Life: 4-5 hours vs 5 hours, Screen Size: 10.6"(1920x1080) vs 11.6"(1366x768), Storage: 128GB vs 64GB(max 512GB), Weight: 0.907kg vs 1.08kg Advantages: Surface Pro: 10-points-multi-touch display with stylus for improved accuracy, microSDXC expansion slot, the first tablet computer that allows serious work (runs the desktop version of Microsoft Windows) MacBook Air: Runs both Windows & Mac OS, Thunderbolt port (10 Gbps) Disadvantages: Surface Pro: Impossible to self-service; extremely difficult to take apart without damaging the unit. For $999 I can buy either the Surface Pro or the Macbook Air 11-inch, but not both. As seen above, there are pros and cons for buying either one. I don't need heavy computing power, but the Surface Pro will allow me to do everything that I regularly do on a desktop computer, but if I go for the Macbook Air, I will be able to run Xcode to write iOS apps since it is an official Mac OS computer (which can also run Windows). The Surface Pro is a tablet computer, which allows ease of use and operation, while the Macbook Air is just a regular laptop. However, I am worried that the Surface Pro may turn out to be a bit heavy to hold and operate for an extended period of time while lying in bed, for it weights about 900 grams; about 300 grams heavier than the Apple iPad (depending on which Model of the iPad that are are comparing with). It is really a tough decision to make; I appreciate very much for any suggestions and advices. Thanks!