A:

Due to the chemical complexity of both the TG and EE forms, once ingested, the body must convert them into the FFA form. This requires the pancreatic digestive enzyme Lipase to separate (cleave) the Omega-3 molecule from the TG or EE molecule; thereby, creating the Free Fatty Acid form, which can then be absorbed into the blood.
Many individuals, including the elderly and those with less than optimum digestive systems, may have difficulty in this conversion process, resulting in them getting less than the full potential of Omega-3 EPA/DHA that is present. For people whose gall bladder is taken away, they lose the ability to digest any fat intake thus they can not absorb any Omega-3 if taking it in TG or EE form.

Flex Power Fish Oil 600, which is already in FFA form, does not need to go through this inefficient separation process. As a result, it is absorbed faster and more efficiently and allows for maximum absorption of EPA/DHA.
Biochem Biophys Res Commun. 1988 Apr 15;152(1):328-35.
Human absorption of fish oil fatty acids as triacylglycerols, free acids, or ethyl esters.
Lawson LD, Hughes BG.
Murdock Pharmaceuticals, Springville, Utah 84663.
The transient rise in plasma triacylglycerol fatty acids after single-dose ingestion of fish oil as triacylglycerols, free acids, or ethyl esters with linseed oil as an absorption standard was used to determine the relative absorption of fish oil fatty acids in eight men. As free acids, the fish oil fatty acids were well absorbed (greater than or equal to 95%). As triacylglycerols, eicosapentaenoic acid (1.00 g) and docosahexaenoic acid (0.67 g) were absorbed only 68% and 57% as well as the free acids. The ethyl esters were absorbed only 20% and 21% as well as the free acids. The incomplete absorption of eicosapentaenoic and docosahexaenoic acids from fish oil triacylglycerols correlates well with known in vitro pancreatic lipase activity.