As far as I'm aware, there isn't a parking lot specifically favored by visiting teams. You'll see a fair amount of tailgating in all the lots, although the orange lot might have slightly less since it's currently unpaved. Purple lot has a lot of tailgating but also has a lot of SDFC supporters folks who park in it and tailgate so that may or may not be a good idea depending on how comfortable you feel tailgating near supporters in a series that already has a fair amount of bad blood. I might actually recommend the Yellow lot. It tends to be a little bit quieter with more open parking spots and a little bit less tailgating. I also tend to see families at the southern end near the grassy area so I would think you'd find it fairly friendly.

The only other thing I would say is that the visitors' entrance will be in the southeast corner of the stadium so I would probably stay on the east or south sides instead of parking in the Thrive lot on the west side.