The Surface Book is expensive especially if you want the version with the GTX 965m GPU. I think it starts at around $2,400. The initial "high end" version has a 940m GPU which is now considered to be a budget GPU. It has an i7-6600u.
The Dell XPS 15 with the best configuration currently sells for $1,900 (it seems Dell is currently having a sale). That's with an i7-7700HQ, 4k touch screen and a GTX 1050.
Overall, the GTX 1050 is a little more powerful than the GTX 965m. You can see some benchmark comparison in the link below which will lead you to Notebookcheck.net. Keep in mind that these are average FPS benchmarks from various gaming laptops and the fact that gaming laptops generally has a quad core Intel CPU, not a dual core Intel CPU. Therefore, games that can take advantage of more than 2 CPU cores will have lower results with a dual core CPU compared to a quad core CPU.
https
/tinyurl.com/k6hyqjm