Well I have all four on one home screen... ( WeatherBug free widget, Weather Widget, shortcut to Weather.com & shortcut to iMap ). My primary mode of transportation is a motorcycle, so I NEED to know where these storms are and which way they are heading. I always had WeatherBug on my storm 1, loved it except the moving radar - that's what I really need.
But as my fav right now on the DX I would have to say WeatherBug still, if I need to see some looped radar I'll head over to Weather.com, but it doesn't seem as accurate as Bug, iMap at a stand still has a good radar but as mentioned the loop is too fast, and the program definitly has some kinks to be worked out. SO in conclusion, instant weather I use Bugs widget and/or Weather widget, and for motion near the ocean I use Weather.com - still tinkering with iMap.
Only one app has alerts set BTW, I know some may see 4 weather apps and think my phone gets blown up with advisories but nah, only 1 set - Bug handles that.
I've yet to try beautiful widgets, I've heard so many good and unforntunatly bad things - maybe soon in the future.