I would also recommend the Lenovo yoga book, I switched from an iPad to a Lenovo tablet a few years ago and have been loyal to Lenovo ever since. From my experience the battery life is way better than any others so if you will be taking it anywhere you won't have access to a socket then it will be a better choice than a Surface.

Another point in favour of Lenovo, my 3 year old niece threw mine out of a second story window and apart from a small cluster of cracks in the top corner it survived and is in full working order. So they are pretty durable too.