Should I take fish oil, Omega-3 or Flaxseed oil supplements?

I don't eat any kind of seafood or red meat. I have SVT, a heart condition, and I read that Omega 3/Fish oil supplements are good for the heart. I went to the store and there are so many different kinds of Omega 3 supplements...fish oil, omega 3, flaxseed. Which one is best? Do they all have the same benefit?
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