Your link doesn't say anything about dementia. Do you have any source that shows EPA is more beneficial than DHA?

What I found from a quick search says the opposite:

https://pmc.ncbi.nlm.nih.gov/articles/PMC4019002/

sorry it requires a little detective work

https://pmc.ncbi.nlm.nih.gov/articles/PMC7760937/

https://pmc.ncbi.nlm.nih.gov/articles/PMC3534764/

> "An X-ray diffraction study found that EPA and DHA exert different effects on the lipid bilayer of cell membranes. EPA readily incorporates into the cell membrane core and stabilizes it, whereas DHA does not"

> "Why does this matter? Cell membranes are essential for cellular function: not only do they provide structural support for cells, but they also facilitate cell-to-cell communication and nutrient/toxin transport. Different effects of EPA and DHA on membrane stability likely elicit different effects in cell signaling. A second study revealed that in addition to stabilizing cell membranes, EPA is also protective against harmful reactive oxygen species and lipid peroxidation"

basically EPA modulates the immune system, DHA does not