Dell XPS 15 and XPS 13 are from same family, so xps 15 also has a infinity edge screen which is 15.6", and 4k ultra hd with resolution(3840*2160).it also has 8 million pixels much more than macbooks.it’s variants comes with 6th generation processors.8 gb ddr3 ram with 2133 mhz speed, also can be expanded upto 32 gb, which is absolutely a very nice thing, also it has a 2 gb of NVidia GeForce gtx 960M graphics memory which is ddr5.so it is absolutely a good machine for gaming, and alsofor business works, as I mentioned it has a 4k display, which makes working with this laptop very comfortable.so I surely recommend to go for this laptop