Transitioning from PC to Mac?

Im a graphic designer but planning on using this for coding since i already have a pc desktop for Adobe programs.

Long story short, im tired of all the bugs and forcequits from adobe programs (experience the same with Dell computer at work and homemade computer at home). Same with Microsoft Publisher, Blackberry programs, and sometimes iTunes.

I had a mac for 5 years til 2012 when my macbook pro failed from old age(2003 iBook and 2007 Macbook Pro 15") Then i started work where they had PC's and found the transition hard so i built a PC.

I see a refurbished 2014 11" Macbook Air ($679) at the Apple online store and a 2012 11" Macbook Pro on average ($500) but i dont see much of a change in specs from 2010 to 2015. Just battery life, slight changes in processors, and addition of ports i dont need (except for thunderbolt). The difference i see is maybe the use of battery.

Originally i wanted the 2015 Gold Macbook but no Magsafe makes it an absolute no. Cant tell you how many times i trip on mine and other ppls laptop cords and saved my butt on Macbooks. The most genius idea.

Difference between Yosemite and previous versions? Dont care much for Facetime and iPhone apps. I use a Blackberry so i want to be able to use Blend and back up my phone.

I just use it for work. I dont watch TV. I prefer the 11". What is your suggestion yearwise for macbook airs? Do the macbook air's age and fail after 5 years like all the other previous macbooks?