LuxRender VS Iray

Cycles Renderer - Cycles is Blender’s ray-trace based production render engine and in development since 2011.

Redshift - Redshift is an award-winning, production ready GPU renderer for fast 3D rendering and is the world's first fully GPU-accelerated biased renderer.

Blender - Blender is the open source, cross platform suite of tools for 3D creation.

V-Ray - Learn why V-Ray for 3ds Max’s powerful CPU & GPU renderer is the industry standard for artists & designers in architecture, games, VFX, VR, and more.

POV-Ray - What was then called STAR-Light, and later renamed to PV-Ray and ultimately POV-Ray, has therefore been on this planet for a whopping 9, 190 (or 11, 000) revolutions by now (plus another guesstimated 150 above it).

Arnold - Arnold is an advanced Monte Carlo ray tracing renderer built for the demands of feature-length animation and visual effects.