I have had both. The Yoga 720 is the better deal for sure, though I think ignoring budget, the XPS 15 is a little bit nicer. The 720 performs better in CPU and GPU due to a better heat sink design, and 1080p comes with a touchscreen. I bought one and then later bought a gigabyte aero 15, so if you're interested in buying mine I'd be happy to sell it for $1000 usd + shipping. i7/8/256/GTX 1050. Repasted and good to go.