I didn't get the touchscreen version intentionally. That's not to say that it's better with/without touchscreen. I just didn't want it, and wanted a lower resolution FHD screen for power savings. I know that gnome has basic support for touchscreens and just switched away from using a Surface Pro 3 with Gnome. It was just ok. I'd say you'll be fine since you've got a keyboard and trackpad as solid backup for the touchscreen.

There is no hardware difference to the windows/linux machines... the hardware on the dev units isn't any less or more powerful. You will, however, want to make sure your BIOS is upgraded to the current rev (A04 as of this posting). http://www.dell.com/support/home/us/en/19/Drivers/DriversDet...