Depends on which direction they're landing aircraft at the time of arrival. From my experience left side of the aircraft is a better bet. If landing on the SE facing runways [12L/R] you get a great view of the skyline and it should be around sunset

If landing on the NW facing runway [30L/R] a view on the left side is a little higher up so you cant see the city well but should get a good airport overview as you have to pass it on approach. Either way I say left side. Just my two cents.