align,
it depends a lot on what your intentions and occupation are. if you are an architect or designer, hence the focus of your work is the design, you would be better off with one of the applications that demand a short learning curve and that are easy to operate. i am talking of podium, twilight, irender, kerkythea, idx renditioner, indigo, pov-ray, etc. however, if you are an ilustrator or work in the visualization field, you might want more control to achieve super-hyper-realism. then it is probably worth – i say probably as you can achieve exceptional results with any of the apps i just mentioned – having a go at the likes of vray, maxwell, modo and others of the same caliber.
but never forget solo's wise warning: rendering is at best 50% to do with the app you use. the rest is up to the artist in charge.