You may want to consider the Macbook Air 13" which is lighter and (I believe) comes with a SSD.
I have both a Macbook Air (by choice) and a Surface Pro (Required for work). I was excited to get the Surface Pro (SP) and really wanted to like it but after being used to a Macbook (MB) I found the SP to be as difficult to use and as frustrating as all Windows laptops.
Many comparisons of the Macbook (MB) and the Surface Pro (SP) compare memory and CPU but ignore the usability, comfort, and level of frustration level of computing devices. When you look at usability and value the MB wins hands down over the SP. Get past the cool commercial with people dancing and clicking the SP keyboard on and off and look at the nuts and bolts and you’ll find that unless there is a compelling reason (such as the common "The application I use at work only runs on Windows machines”) to own a SP you will be much happier with the MB. Ask around and you will find many former Windows users that now swear by Macbooks while it is very difficult to find a former MB user that has chosen to switch back to Windows. Another key consideration is that MBs tend to continue to run better for years. Apple operating system upgrades are free and won’t slow down the machine to the point where it becomes useless. Find someone with a five year-old MB and someone with a five-year old PC and see which person is still happy with their computer.
Here are a few points to consider if you are trying to decide between a Macbook and a Surface Pro:
1. There are many little things that make the MB easier to use and less frustrating. For example, the chargers for both the SP and on the MB connect magnetically and have indicator lights to let you know they are connected and charging. On the MB the light turns from amber to green when the battery gets to 100% charged. On the SP you need to start the computer and log in to see if the battery is at 100%. This is a minor difference but it sets the tone for how these machines are different. The MB just does it right while the SP tries to be like a MB but fails.
2. The MB charges significantly faster and lasts significantly longer than a SP.
3. Both the MB and the SP have a multi-gesture touchpad. On the MB the touchpad works every time. When you pinch, tap, double-tap, or whatever, it does what it is supposed to do. On the SP the touchpad works 'most of the time' at best.
4. When the MB sleeps it wakes fast and it wakes every time. Open the cover and the MB is ready to go. With the SP, open the cover, press the power button to wake it, press a key or touch the screen to finish waking it, hope that it didn’t actually shut down rather than sleep. Sleep mode and especially waking from sleep is something that the MB does much better. Sleep mode works so well on the MB that many MB owners seldom shut down the computer.
5. Cloud computing and integration - iCloud works better than MS account/OneDrive/Office365. iCloud provides seamless integration between all your devices even to the point where if your iPhone is in the kitchen and you are in another room on your iPad or MB you can answer your phone (or make calls) on whatever device you are using.
6. Many laptops are actually used on your lap (thus the name ‘laptop’). The MB and SP are both comfortable on a desktop but the SP is less comfortable on your lap. With the kickstand out it is a balancing act to keep the SP stable while typing. Before deciding which to buy try sitting in a chair or on a sofa with the machine in your lap and see how it feels. Try it in different sitting positions especially where you need to open the SP kickstand.
To be fair, there are some things a Surface Pro does better:
1. It can be a tablet or a laptop although a much worse tablet and much worse laptop than using a Macbook and iPad. The touch screen works in laptop mode although I find that the machine often goes into tablet mode while I'm using it as a laptop and I have to shut everything down and restart it to get it back into laptop mode. OK, maybe this isn't a point that the SP does better...
2. It has a usb slot for tablet mode. The MB has a usb slot and a sd card slot but the iPad has neither.
3. The magnetic connection for the charger is stronger on the SP so less likely to unplugged while charging. A good thing since it takes so long to charge the SP
I tried but I cannot find a significant reason for why anyone would pay more money for less capability with a Surface Pro...