At one time the various weather web sites and apps had some uniqueness. No longer since weather channel owns almost all of them.
However, all weather apps/ web sites/ tv stations/ radio stations start with the same forecast data from NOAA.
Choose one that you like the interface. I like local TV stations for the weather for the next 12-24 hours. Farther out than that, most TV stations feature potential for bad weather. It’s marketing. IF there is a possibility of bad weather, more people will tune in.
I like the interface for the 10 day forecast, radars and such from Intellicast.
One caveat. If you are facing an actual severe storm occurring NOW - the local TV station will have the best information. Though they tend to use community and road names intended for local viewers.
We went thru a tornado less than one mile from the COE campground northeast of Dallas on Dec 26, 2015. I was the only one of the folks crowded in the concrete bathhouse who knew how close the funnel cloud was to us because I had lived in that area for 30 years. We had a similar situation with tornado touchdowns five miles away several years before in Waco, but I didn’t know the local geography very well. So I didn’t realize how close it was to our trailer.