If I were going for commercial use, I would go with a tablet or a fast laptop. The video feed from the drone to the phone is not going to be 4K, it's going to be much lower in resolution. If the image quality to the client is important, then get something like a Microsoft Surface Pro. You can pop in the memory card from the drone and play it on a larger and higher resolution screen than what would be on the phone. You could also an iPad Pro, but you would need a memory card adapter hanging off the iPad. The Surface Pro would be easier to use in that regard.I am thinking more for commercial use. You can show a client photos and raw videos from the DJI go app to make sure you have the best shots before you leave the site.