My macbooks to date (2) have been silver, I quite like the silver colour and have gotten really used to it!
I just got a silver MBA and I honestly think silver is my preferred choice, especially since it is supposed to hold up a bit better with wear and tear than the space grey. That being said, I'm thinking of changing from the 8GB MBA I got to a 16GB one, and the only 16GB ones that occasionally pop up for store pickup are the space grey 8/16GB/1TB variant, so I might switch to space grey if I find one for store pickup. (Silver doesn't seem to be available in this configuration for store pickup...)