Which opensource driver should I choose?

Hi,

I'm working on a project and should use the opensource driver of AMD. But I dont know which one to choose.

My environment is an Opensuse OS and

1.AMD Radeon HD 7850 +

2.AMD Radeon HD 7770 +

3.AMD A10-5800K APU with Radeon HD 7660D

2 GPUs and 1 APU, all these are supported by AMD company.

Thanks