Twilight - Select this option if your photos were taken during sunset into twilight. Photos will look much better if they were shot preferrably 5 - 10 mins after sunset.
Virtual Twilight - Converting photos (taken during the day) into twilight. Select this option if photos were taken during day. We will digitally brithen up all windows and darken the exterior in photoshop. Make sure you select a sky set for sky replacement. Photos would looks much better and real if they were shot during an overcast day. see example
Manual Blending - Photoshop blending 3 to 5 images + window clipping mask.
Manuel Blending Basic - Same as manual blending but without sky, TV and fire insert.
HDR - High dynamic image merging without window clipping mask (usually for lower end properties)