Which to Macbook Air to choose?

Hi,

I'm looking for a new MacBook Air and am looking at a refurbished model. I am stuck with choosing between these two:

Refurbished 11.6-inch MacBook Air 1.3GHz dual-core Intel Core i5

Originally released June 2013

11.6-inch (diagonal) LED-backlit glossy widescreen display, 1366-by-768 resolution

4GB memory

256GB flash storage

720p FaceTime HD camera

Intel HD Graphics 5000

Refurbished 11.6-inch MacBook Air 1.6GHz dual-core Intel Core i5

Originally released March 2015

11.6-inch (diagonal) LED-backlit glossy widescreen display with support for millions of colours


4GB of 1600MHz LPDDR3 onboard memory


128GB PCIe-based flash storage


720p FaceTime HD Camera


Intel HD Graphics 6000

I use my computer for teaching online students and photo editing mainly. I have an old white MacBook and I'm only replacing it because I can no longer update it and the software I'm required to use for work will not run on it. I've found, since I've had my computer since 2008 I've been running out of storage.

Which computer would best suit me needs?

Thanks in advance,

From the a hopeless techie!