Omega 3 capsules versus Flaxseed?

My doc told me last week that it’s a good idea to be taking some source of Omega 3. She suggested either capsules of (pure) Omega 3 and/or flaxseed.

I have some general questions for people who are taking either one or the other.

- if you’re doing flaxseed, are you using the oil or the ground flaxseed powder? How do they taste? More importantly are you seeing any side effects (gas, upset stomach)?

- is there a benefit to oil versus powder?

- since both flaxseed and Omega 3 pills supply Omega 3s, is one advised over the other?

Thanks