My favorite GPU rendering engine is hands down Octane, now in its 4th, 2018 and 2019 versions. It’s made it so much easier for me to light and render the scenes in the episodes of Nkoza and Nankya, and for a number of my cinematics and short films. I render using Octane in both Maya and 3DS Max.
There was a time when I rendered primarily with Mental Ray, but once the industry shifted to GPU and realtime rendering, I pivoted to using GPU rendering as well. The demand to turn around 3D renders pretty quick has also driven my quest to find the fastest way I can realize my scenes both as concepts and final renders. Some of the challenges have been rendering things such as smoke, volumetric lighting, dust, and fluids, but all those issues have been addressed in the most recent builds of Octane.
Check out some of the renders I have done using Octane for the Nkoza and Nankya episodes. Series Website: www.nkozaandnankya.com ~ Subscribe to the Nkoza and Nanjya Youtube Channel at: https://www.youtube.com/user/NkozaandNankya ~ Visit and like the facebook at this link: https://www.facebook.com/NkozaandNankya/
You can see more renders at the Nkoza and Nankya gallery at this link: http://www.nkozaandnankya.com/gallery/