Rendering with external.

Does anybody know what the best rendering program is?
I mean the free ones like Indigo and Yafray.
Which one should i choose?

It depends on what you want. Indigo provides the best quality results but takes a long time. Yafray is fast, but doesn’t have the quality of Indigo.

you really just have to try them.
some people like super-realistic-on-the-first-render-ever renderer’s that you have to let render for days, but some people like renderer’s that you have to tweak for days to get perfect photorealism, but the renders get done in a few hours.