I don't think there is a perfect app out there if you are trying to find everything in one place. Most of them just take the various computer models and go with the average across them for temps, rain coverage % and winds. Now, if you are talking radar, the Weatherbug Elite App's radar is about as good as they come. My Dad has been in the weather business for more than 35 years and the first time he saw that radar while sitting in a field dove hunting, he was shocked.
So to answer your entire question, here's what I do. I have the app mentioned above I use more for radar than anything else then I have a web link (favorite) saved for NOAA (weather.gov). In my favorites, I keep 2 separate links, 1 for my home and 1 for my lake house. Then if I need to look at another area I use the search function. For me, NOAA's forecast have always been the most accurate but they do not have an app.