Of those I like the circle and the diamond, they grab the eye as on the piss (well my eye anyway)
The square for me at first glance shows no error,it is not without concentrating on the quarter sizes I can see any error and it should be instinctive.
This is one of the reasons aperture sights were so good for so long because the eye will naturally center circles very accurately.
Very small dots for me are difficult, it becomes like the cross on cross example above where you have to move on and off target to be sure you are on target, you need that bit sticking out for your senses to center on.
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