External renderers and speed

I´m working in a short to learn blender better and had the idea of working with a external renderer and wanna know for the same quality of render wich renderer has the best speed: yafray, indigo, sunflow, pixie or 3dLight?

Actually… blender’s internal renderer is extremely fast. Depending on the light quality you’re looking for of course. But if you’re doing it for yourself, yes… the internal renderer is definitely the fastest. The quality, if you get the settings right, is also very good. No need to use an external renderer.