With DirecTV Now, your available local channels/Regional Sports Networks (RSN) are tied to your billing address, except when travelling. There is probably a database error, which causes you to receive the Seattle channels from one locale in Arkansas.
With YouTubeTV, your available local channels are tied into the location where you originally signed up. WHen I first signed up for YouTube TV, It was not available in the Gulfport/Biloxi area (due to lack of local channel agreements). I used a Chrome browser extension to spoof my location in New Orleans, so I could sign up.
If I ever wanted to view the local channels in a certain area, I would spoof my location to wherever. However, I could not view the RSN's from the area in which I travelled. My "home" locals/RSN would always be shown on the travelling device.
The YouTubeTV app on AppleTV shows the local channels/RSN which you have designated for your home area (You can move twice a year.) I just moved to Chicago, for baseball season.

For this reason, and a few others, YouTubeTV is my choice over DirecTV Now (I have had both).