I use "BeWeather - Best Weather App 2010" version 2.6.12. I find that it does everything I want and works perfectly. It also has a very low resource usage footprint.
I have quickweather and i love how you can put it anywhere on your screen. Doesn't seem to affect my battery life and there's lots of info available like "feels like" which is nice in both winter and summer.
Berryweather is fantastic. Been using it for over a year now. I love the user interface and the options it has let's say. I also used weather in the past (2yrs.) and wasn't satisfied that much. I say go with the Berryweather
Berry Weather has ruled the roost for a number of years and I am very happy with it. I gave my son a copy who refused to install it saying he got better weather reports from a weather website.
Like the OP I have (and use) both. Quickweather on my homescreen so I can see it at a glance and BerryWeather (at the click of a button) if I want more detail. Fab combination IMO.