Flaxseed or Fish Oil

I did Braggs apple cider vinegar. I also took a magnesium and l-arginine. I am taking a vitamin every 3 days. I also like hemp oil once a week. I figure all this stuff is good while letting the body fast and cleanse during the 23 hour of not eating.
I take flaxseed oil and fish oil for different purposes. If I have to use it externally, I use it as per the need. Hence, I could never differentiate between flaxseed oil and fish oil. Also, there are a variety of fish oils that would be essential for human body.

Both the oils have important nutrients and can be used as a good source of omega 3.