Obviously, the cost to sequence a genome depends on its size. The discussion below is focused on the human genome; keep in mind that a single 'representative' copy of the human genome is ~3 billion bases in size, whereas a given person's actual (diploid) genome is ~6 billion bases in size.
Alternatively, EPA has a more beneficial effect on lowering overall LDL (bad) cholesterol. In the cognitive domain, DHA appears to offer greater mental benefits. DHA has been suggested to be more effective in improving overall cognition and preventing cognitive decline in healthy older adults.
DHA can benefit your mind. Fish has been called brain food, but DHA deserves the credit. DHA is highly concentrated in membranes of brain synapses and in the retina of the eye. DHA declines in brain cell (neuron) membranes with aging may result in declining mental function.