Which Omega 3 supplement is better?

I'm comparing the NOW Foods Ultra Omega 3-D fish oil vs Sports Research Omega 3.

NOW has per pill:

-600mg EPA/300mg DHA

- plus some Vitamin d3

Sports research has:

- 690mg EPA/310 DHA

I've seen alot of post recommending Sports research but nutrient wise they seem pretty close, plus NOW foods is alot cheaper : $69 for 180 tablets vs $98 for 180 tablets for Sports Research. Is it worth spending extra money for the sports research one or should I just get NOW?

Thanks