I use an XPS 13 and 2016 MBP daily. They both have great trackpads.

The only place where the XPS 13 is inferior in terms of build quality, so far as I can tell, is coil whine. I believe they've fixed that in the most recent versions.

Also, even though it's not a big deal I'd rather not have a touch screen at all as I do on the XPS. It's useless, and registers touches when I close the lid (I prefer not to suspend if I'm just walking from one room to another)

Edit: I should note I use Ubuntu exclusively on the XPS 13. I don't know what the trackpad is like in Windows. Presumably it's comparable.

They did not fix the coil whine. Nor the dynamic screen brightness issue. Just FYI. Oh, and the I2S mode for audio is still broken in the latest kernels (headset microphone not recognized, loud pops at power saving switchoffs), so I have to use Ubuntu to get a HDA-enabled kernel out of the box.

Also my XPS13 is 2 years old and the "carbon fiber" cover started to disintegrate along the edges. The screen hinge is a bit loose so it wobbles a bit with movement.

Other than that it's fab :)

The fix for the dynamic screen brightness is to flash a firmware that dell provides for the HIDPI display. If you have the 1080p display, you are out of luck.

Just bought a brand new 9360 and the coil whine is definitely not gone.