Compared to Hair Farm, I much prefer the look of the dynamics Ornatrix gave. The Help documentation is a lot more organized and easy to navigate. But it’s probably just because of the way I created my hair extrusions - thick ones. What it probably lacks is the simulation of smaller strands. 
It is also safe to say that sims are a lot more robust compared to Ornatrix, I get to retain more of the overall shape of the hair easily by just selecting portions of the HairMesh that I want to be affected by the HairMesh Sim (dynamics) - also largely due to the feature Gravity Compensation. * Notice also that the more details you add to the HairMesh, the more that it would create some folding (noticeable during collision with the pink block). * It appears that even if you add more details to the HairMesh extrusion (via Vertex Separation and HairMesh Smoothing), you would typically get more or less similar results for the sim. Update : Did a bit more tests on the effect of a simple HairMesh versus a complex one.Ī: Simple HairMesh Extrusion (3 levels) on a 1×1 segment plane.ī: Same as A, but with HairMesh Smooth applied to add more subdivisions.Ĭ: HairMesh Extrusion on a 3×3 segment plane, applied Vertex Separation, creating thick strand-like extrudes.ĭ: Same a C, but with HairMesh Smooth applied. I would need to add HairMesh Smooth in order to increase the resolution for better collisions (which is actually quite nice from a workflow standpoint). The dynamics seems to be lacking in realism though, as the system relies on your underlying HairMesh topology (imagine sort of simulating a low resolution cloth object). It doesn’t rely on the number of vertices/points in order to get smooth hi-res hair. Hair Farm also allows instancing and Wisps where you can use it to create feathers, forests, grass etc. Like using the Link feature, I can somewhat do a rig where the hair would be sort of ‘skinned’ to it, allowing manual animation. You have a bit more options in doing out of the ordinary hair setups. (without the exact numbers) It does render hair a lot much faster compared to Ornatrix. This is especially advantageous for users who are so used to modeling using polygons. 
I found it much easier to create hair using their HairMesh tech. 
And here are some comparison notes that highlight advantages/disadvantages that I’ve encountered:
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