generally when were talking pumps max head is more important i watercooling loops and the reason is because of the restrictive design of cpu blocks, Nb blocks gpu blocks etc.
an example of this is comparing the swiftech mcp600 pump (690lph, max head 3.2m) to the eheim 1250 (1200lph, 2.0m max head) the eheim is designed for aquariums and ponds hence its more of a free flowing pump and has an open impeller, the swiftech has a closed impeller and produces higher head, this is beneficial because when we get into restrictive setups especially with blocks like the cascade and white water. the pumps with higher head will have a higher flow rate.
well thats my 2c, back to biology practical :s
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