I recently bought a 2015 13" MBP w/ 16GB precisely for professional iOS development. Works like a dream and is amazingly portable. I would really suggest to get

I recently bought a 2015 13" MBP w/ 16GB precisely for professional iOS development. Works like a dream and is amazingly portable. I would really suggest to get 16GB memory if you're looking to run multiple vagrant boxes. Specs of my 2015 MBP 13": MacBook Pro (Retina, 13-inch, Early 2015) | 2,9 GHz Intel Core i5 | 16 GB 1867 MHz DDR3 | 250GB Flash Storage