Which protein is more efficient at oxygen extraction for an AIR BREATHING aquatic species? Haemoglobin or Haemocyanin?

Another question concerning the Tetrapi, I would like to know if having haemocyanin-based blood (copper-based blue blood) would be an advantage over having haemoglobin-based blood (iron-based red blood) for an air breathing aquatic species. Is the fact that the majority of animals have red blood grounded in evolutionary pressures or is it just an evolutionary quirk? In a nutshell, do I have to follow strict guidelines or am I spoilt for choice?

Find the most efficient blood type to extract oxygen from an atmosphere composed of 28% Oxygen, 72% Nitrogen, 0.4% Carbon Dioxide and 0.6% other gases with an atmospheric pressure of approximately 0.85atm. Please justify your choice. The answer does not require hard science, although some citations and illustrations would be most helpful.

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Which protein is more efficient at oxygen extraction for an AIR BREATHING aquatic species? Haemoglobin or Haemocyanin?

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