Hi TS, how do you plan to use your SUV? Will it be a fair mix of on-road and rough-road? Or will it be more on-road? Will you be doing long drives or short drives?
Between the two, I'd say the X-Trail would be your best bet if you have long drives and a significant amount of rough-roading. The X-trail has a great suspension, with the ride being very comfy, even on rough roads. It also has a very good power output of 170 hp*6000 rpm and torque of 245 Nm*4000rpm. Space-wise, it's really very comfy for passengers and the cargo area is big. Note that I have the older X-Trail 250 4x4, which I find both powerful already and has a significant space, yet the CVT edition has upgraded power and slightly bigger dimensions, so you do the math

The downside of the older X-trail is poor city fuel consumption, where I average 5, and if lucky I hit 5.5 km/L. The CVT version should be better. Highway driving is very good, though. I easily hit 11 km/L and at one point, hit 13 km/L while averaging 110 kph. The CVT edition should easily surpass that.
If it is more of city driving that you will do with some long-haul drives to provinces, then the ASX is a good choice.The default cargo area is much smaller than the X-Trail's, but foldable rear seats will increase the volume, though if you carry a lot of cargo and passengers, then it could get a bit cramped. The smaller size of the ASX (as compared to the X-Trail) makes it more nimble than the X-Trail, though, which is very useful in city traffic. The ASX would also have a bit more stiffer suspension than the X-trail, so handling and performance is better in this regard as opposed to the X-trail. With the x-trail, you can feel significant body roll on tight turns at significant speed (though why would you do that in the first place in an X-trail? lol)
My take is that if comfort and power is your primary concern, go get the X-trail; if you prefer something more sporty in terms of handling, then get the ASX. The X-trail has the stronger pulling (and carrying) power, the ASX has the better handling. Oh, the stock ASX also has more toys, with a GPS unit included, while the stock CVT X-trail doesn't. The ASX comes equipped with 17-inch alloys, the X-trail with 16 inchers. And the ASX comes with paddle shifters, a big deal if you like going zoom-zoom
