fish oil what difference bewtween 18% epa-12% dha vs. the total 30 % fish oil kind?

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as said, or is there a better % type of fish oil?

 

[Kaladryn]

There is a higher purity, Jarrows makes one called EPA/DHA balance that is 50% EPA/DHA, there is also a "Zone Diet" version of the same purity.

Jarrows EPA-DHA Balance, each pill:
Fish Oil Concentrate 1200 mg
Omega-3 Fatty Acids 630 mg
EPA (Eicosapentaenoic acid) 420 mg
DHA (Docosahheaenoic acid) 210 mg

 

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also does anyone know where to get some fish oil in bulk? like by the jugs