MBox Pro 3 or Focusrite Siffire Pro 26?

[joelouis]

Hi, I'm buying a new Mac Mini i5 and Pro Tools 11/12. I'd like to get some advices about what interface to buy: MBox Pro 3 or Focusrite Siffire Pro 26?
Thanks in advance

 

[Steenamaroo]

It would help if you tell is what you want to do with it.