Well, Marmorset Toolbag2 is a relatively low priced rendering solution. It also gives great results in real-time to show of quickly assets made in MoI, imo. Nice thing about Tb2 is also you can upload your scene files to Artstation, so that other can look at the model.

https://www.artstation.com/artwork/hilbert-cube

Blender of course is a free solution, but has a higher learning curve, once mastered however it's a pretty cool app too.

Here are two different models showing how cool imo PBR Shader Painting can be. Second pic is the robot contained in 3D-Coat, quickly textured and rendered with Blender Cycles and lit only with a HDRI image. First model is a Hilbert Cube modeled in MoI and rendered in Marmoset Toolbag2 (rendered in about 2 seconds on my old iMac) also lit with an HDRI only.

Regards
Stefan