I don't know enough about the Dells to comment sorry. My current is an i5 T530 with a FHD display and 3rd party RAM/SSD upgrades. Works solidly with Ubuntu - t

I don't know enough about the Dells to comment sorry. My current is an i5 T530 with a FHD display and 3rd party RAM/SSD upgrades. Works solidly with Ubuntu - the only time it boots are after I finally get around to installing kernel updates. It flawlessly suspends and resumes in between times. The 15" models might be too heavy for you - mine spends most of it time docked with a 27" monitor. I didn't need much portability.