I try to sit on the side away from the sun, so in this case (northeastbound morning flight), the left side.

You can always see much farther looking away from the sun rather than into it, so you can see more scenery (not that there will be much of that once you get past the NM mountains). Plus you won't get the intense glare from an open window shade, especially early when the rising sun angle will be low given the departure time, which your neighbors - who may be trying to sleep at that hour - will appreciate.