Keep the 2012 Macbook. I'm a pro user and upgraded to the 2018 model, cause I need every bit of power I can get. Besides the welcome power upgrade, I still feel the retina Macbooks are the best Apple ever made. Everything about it is right. Power, RAM, SSD, Ports, Weight, Keyboard, no annoying Touchbar. For consumer usage, this is a no brainer. Keep the 2012 model until it dies on you.