If I want extra points outside of Mexico, I usually choose the Rally DLC.
This is because all races in Rally DLC are sprints, so I can finish the championship faster than HW and Mexico, and the map design is basically the same as Mexico.
Many of HW expansion's courses are very long, making them time consuming even with S2 or X class cars, and the fact that many are circuit races makes matters worse.
Furthermore, many of HW expansion's races are super high speed circuits, or circuits with super high speed sections. Therefore, it requires cars with extreme upgrades that are not used in the Mexico and Rally DLC maps. So if classes and cars are specified like in the playlist, it takes even more time to build those cars.
For these reasons, I will not return to HW expansion unless absolutely necessary...