For Excel and PowerPoint, Intel integrated graphics is perfectly fine for driving 2 monitors and the laptop display. More important is an i7 CPU, 16 GB ram and an SSD drive, which both laptops have. Touch display is up to you - depends on how you like to interact with your laptop. I'm using a similarly equipped Dell E7470 right now driving two 24 in, 1080p monitors - no issues. A dedicated GPU is basically a necessity for gaming and some video rendering tasks.