I think the comparison between the X4 and Macan is moot; the only reason they're being compared is due to their similar size and release dates.
The Macan is $5,000–10,000
more expensive to buy, more expensive to own over the long run (X4 35i's ~
19/26 MPG* vs. Macan S's
17/23 MPG) and more expensive to maintain (Porsche parts and labor).
*Edit: X4 is actually one better at 19/27 MPG according to the
EPA sticker.