Have been using vostro v13 (the previous generation before v131). Great lightweight mobile machine. One of the decisive factors in the choice was a matte display. And yet he had an aluminum housing. No complaints on the build quality and the work can not be present.
Of the two, I would choose v131 without any hesitation.
However, you may want to wait a bit: coming soon xps 13
. In my opinion, would be a great camera.