I do my regular mix. I have 2 speaker out channels configured in the Control Room. One (Speaker Main) is straight out. The other (Speaker Master) is configured with my general mastering tools (in my case IK Multimedia’s TRackS-Grand). This allows me to hear what the project will generally sound like in the “mastered” environment. As a result, I can quickly go back and get that snare part or whatever may or may not be popping out before I export it out. Additionally when I export the project out, it is unaltered by the the Control Room channel.
I export out to get a more isolated mastering environment so I can focus on the sound and levels relative to the other projects that may be included in my collection as I am no longer thinking about the mix. Sort of simplifies things a bit by getting rid of all the channels and tracks.