Modeling apps are very personal. So like modus0 said, you need to try them all untill you find one that fits you. Don't spend any money on a modeling app untill you find one you like and if you like to model at all. It might not be something you will like to do once you try. Not everyone likes to model.

I first started with Wings, found that's what Iliked and was easy for me. Then I jumped into Shade, a bigger learning curve but worked well for me. The 2 apps together worked great. I now have Hex2. It's like Wings on steroids. I use all 3 apps for one thing or another. each has it's own strengths.

Here are some clothes I made using Wings and Shade. All started in Shade and finished in Wings. Then run through UVMapper Pro.

I also have a begginers clothing workshop at PoserPros for Hex.