I have just pondered the very same. Once you are down under an arc minute mis-alignment what software do you best trust and are you trying to align on the SCP or the refracted SCP?
I am soon to try and roughly determine the precision of PEMPro (my general favourite) or Tpoint over Maxpoint over PHD (with guiding switched off). Next I will give APT's DARV a shot.
I don't think I have ever seen a definitive review over which method gives optimal results for a permanent observatory once your gear is all tightly coupled and tuned and your polar alignment is already rather close to spot on.
Be very, very interested in others findings and views?
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