Hi All, need some advise here.

I was thinking of doing some iOS apps so now might need to get either Macbook Pro or Macbook Air.. mostly i going to use it for Swift, Xcode and maybe (just maybe) unity3d.. I have some question regarding this.

1. i know that we can use VM and run OS X on Windows, but some say it is slow compare to Mac? is that true?

2. I was considering either 13 inch MBA or 13 inch MBPR, which is better?

Thanks!