[green7ea]

I have a Yoga 2 Pro and a T420s (when the Ts still had nice keyboards). The T420s is a much more enjoyable machine for development work. This is mostly due to the screen being matte. This reflectivity of the screen affects me much more than the resolution (1600x900 vs 3200x1800). Another important factor is the amazing original IBM keyboard with the red knob. I have to agree with grand-parent that Lenovo's quality has gone downhill in recent years.

I have ArchLinux and Ubuntu on both of them and they both work fine after a few HiDpi scalling tweaks on the Yoga.

*edit: I forgot to mention that the T420s has built in ethernet and a hardware switch to turn off the wifi (bios level, not physical) which are two other features I enjoy.