If I am cutting out a rectangle that fits both in the X and Y direction, is there a recommended orientation to align it?
For example, aligned to X
or aligned with Y
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It is more stable along the edge of Y, but mostly I do ignore that. 
I usually think ‘which way will waste less material’ because I’m cheap 
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Do I care about the orientation of the wood grain? This often dictates how I can put the material on tbe machine.
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How hard is the material to cut? The LR only has 1 X axis motor, but 2 Y axis motors, so for more difficult material, I’m in the habit of trying to keep the strain on the X axis motor down to help keep it cooler. Load does seem to matter to temperature, and not just current, not that I can explain why…
These criteria often dictate material layout in CAM for me, given a shape that fits either way.
Well I would rotate the part in CAM, so the result should be exactly the same.
I just cut wood right now, but trying to develop best practices.