DFT related softwares: VASP,ab initio,DFTB,ELK,WIEN2K

[Douasing]

There are many DFT(density functional theory) related softwares,for example,VASP,ab initio,DFTB,ELK,WIEN2K,and so on. Which one do you use?
What are the advantages and disadvantages of these first principle softwares in your opinion?

 

[ModestyKing]

I'd be interested in seeing the answer to this question as well :)