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Fish oil is not easily digested by everyone, but that is not the only reason why micro-algae is superior to fish oil. Two key nutrients (EPA and DHA) only achieve an optimum level of bioavailability for the human body when they are present in the Phospholipid portion of fats.
Phospholipids are needed to transport the important nutrients into your system, and then directly into your brain. The EPA and DHA in Phospholipids (micro-algae) are better absorbed than EPA/DHA in fish oils because they can more easily cross what is called the blood/brain barrier to your brain. This barrier protects the brain from most foreign substances that come near it, not allowing them inside.
In other words, the transfer mechanism to your brain (where you need these essential fats the most), is more efficient with micro-algae.
When marine life eat Phytoplankton (or they eat creatures that eat Phytoplankton) they use the Phospholipids (just as humans would) in order to help transport the EPA and DHA to the cells of their body. It is not surprising therefore that the EPA and DHA that is stored in human cells is mainly in the Phospholipid form, and only a small amount is in the Triglyceride form.
Fish oils contain mostly Triglycerides and only a small amount of Phospholipids, that is why Nutritionists recommend we eat (when possible) whole fish such as Wild Alaskan Sockeye Salmon rather than extracted fish oil.
And now there is Living Proof™ Marine Phytoplankton which also contains EPA and DHA in its original Phospholipid form. Remember, Nature did not provide our ancestors with fish oil supplements!