Definitevely IMHO the new kid on the block AKA Redshift on daily's base is the winner for me.
Except for volumetric rendering and shading which are still on developing, Redshift beats Arnold in price and speed. The quality and integration in Softimage, gets an A+ With Redshift I have obtained for the first time in my life, the desired result from the beggining, without post render suprises like flickering, noise, jittering, nor fireflies. Second in my list iist is Arnold. Since Redshift I only go for it when doing volumetrics. V-ray.... I never considered it as a real option although I was in the Beta test team, for our pipeline. Great quality, but not so easy to setup to get noiseless renders for animation If your work is more oriented to single frames might be worth to take a look at it. Maxwell. Amazing results but extremly slow. If you don't care about render times then Maxwell is also a winner. Cheers!
