What is the difference between AXIEM and EMSIght? What are the advantages of AXIEM over EMSight if any?

Question

I am wondering what the differences are between AXIEM and EMSight. Are they application related? Is one better than the other one? Please explain.
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Answer 1

AWR considers AXIEM the most powerful planar EM simulator around.   AXIEM is the focus of continual research and improvement while EMSight is only worked on if serious deficiencies are found.  Here is a summary of the differences:
Meshing
EMSight must mesh the grid nearest to the conductors using rectangles.  This causes the mesh to have more mesh elements when there are small and large geometries.  The grid must be small enough to capture the small geometry but then causes the large geometries to be over meshed.   Additionally, angled or curved structures causes meshing inefficiencies.
AXIEM meshes the shapes, rather than a grid.  Additionally, the mesh can be rectangle or triangle.   This allows for a much more efficient mesh.   Typically AXIEM will have a much more efficient
AXIEM contains the ability to process shapes to clean up geometries that cause mesh inefficiencies.  EMSight does not contain this capability. 
AXIEM can mesh shapes as thick metal, EMSight cannot and user's must make approximations when  thick metal will change coupling (loss is accounted for properly with metal thickness)
Ports
Ports are mostly similar but the parasitics due on AXIEM ports are less.  Additionally, AXIEM doesn't have a side wall, so the effects of not moving the reference plane from the edge of the line are much less in AXIEM.  
Ports can be added at most any location in geometry with AXIEM.  For EMSight, ports are usually only added on the outside of the geometry and have limitations to reference planes per side of the enclosure.  
Solvers
EMSight does not have a low frequency solver.  It will go low in frequency and then extrapolate to DC.  This usually works okay, but you must be aware of if the extrapolation is accurate.  AXIEM has both a low and high frequency solver so will do much better at lower frequencies an usually much better at DC.   
EMSight's solver scales O(n)^2 for memory and O(n)^3 for time.   It does have a special algorithm to break up the memory issue, but the time issue is the killer.  AXIEM has a direct solver which scales similarly and an iterative solver which will scale O(nlogn).   Said another way, AXIEM can solve much large problems that EMSight.   
More of AXIEM's processes are multithreaded than EMSight.  
Enclosure
EMSight is inside a perfect conductor sidewall.   This works well if you circuit is in the same cavity.  If not, you must know the rules of them on how far to space shapes from the sidewalls as well as how far to extend the port deembedding reference planes.   AXIEM does not have this enclosure.   AXIEM does not currently have a good way to simulate a perfect conductor sidewall.  
I am sure I missed some aspects of the tools.   From AWR's perspective AXIEM is the tool of choice except in a few rare circumstances were EMSight might be needed.