I'd get the Fox one personally, there are multiple options depending on which shock you have.
The Evolution shock you have has a higher nitrogen charge in it than a lot of the other shocks and you need to make sure you have an air can that is designed for that charge.
Talk to your local shop and have them call the distributor (or call the distributor OGC yourself) to make sure you get the right can for your shock, otherwise you're doing yourself a disservice and potentially wasting money.
It's also possible you might need to increase your rebound damping once you install a can with a larger neg chamber. Because the shock has much larger neg chamber it will have much lower initial breakaway force. Some riders have reported that they must run substantially higher air pressures to make up for this and get the right amount of sag and consequentially you might need to slow your rebound to contend with the higher PSI.
Here's an install video.