I did Django dev work for 6 years... I'd lean towards the Lenovo, but it depends on a few things: 1. Are you going to do any photoshop work, or other design ta

I did Django dev work for 6 years... I'd lean towards the Lenovo, but it depends on a few things: 1. Are you going to do any photoshop work, or other design tasks? 2. Do you want to use an external monitor? If so, does the T420 have good specs? One final thought: We've been moving towards using docker for most development, and Apple is behind the curve on this one, mainly due to the crazy workaround required to get adequate filesystem support. If that's at all in your future, stick with linux.