I have been taking fish oils for a while now. I tend to try to stick with a Salmon oil with very high Omega 3 fatty acids. There are some out there that have 2x the Omega 3 content than others.
I also take 2x a day. Right now I'm trying Nature Made Double Strength Fish Oil - 1200mg. They have 672mg EPA Omega 3, and 552 DHA Omega 3 which is twice the content of most fish oil pills. So far so good.
I have noticed I do not get fishy burps with these.
There are a lot out there, and probably some that are better than these - this is just what I am trying at this point.
My advice would be to look at the EPA and DHA content if it is posted. The higher the concentrate per pill may help, may not - I am not sure yet but so far mine are "helping"...
However i am in a major flare...so really right now nothing is doing so great....I may look back into getting some Probiotics and also some rectal meds....