If you take a picture of a real estate or the interior of any house, you should learn both HDR and fiery techniques.
As in Nathan Cool Video, HDR has some color cast issues and does not have luxury real estate photography. The overall form of HDR is much more disaturated and is slightly washed in the final image compared to the flambium. There will also be color cast issues with HDR, and post-processing takes too much time if you want it to look professional.
The shoot is going to take longer to shoot the flambman but short time in Photoshop. The HDR is too fast to shoot, but the post-processing can actually take a lot of time. There are retoters abroad who will do your HDR post-processing, but it will cost money, so you have to consider whether the financial cost is worth you.
As Cool says, you also want to know how to shoot HDR for very large commercial places or communal places, where you may not have much time for shooting. Because HDR is very fast, it will be the preferred method in those situations.
You can eventually make more money shooting luxury real estate with fiery, as this style is looking for high-end agents. HDR is a very fast, less expensive way to shoot, so you probably won’t earn that much money. But if you both learn, you can apply whatever style you need on the basis of the house.