Many companies that offer liquid fish oil supplements often add lemon or other flavouring to help it go down easier.
There are now gummy chewables on the market for both kids and adults.
As far as the Fish Oil vs Flax Oil debate,ultimately,the choice is left up to the individual to decide which is best for them.
http://www.energyfirst.com/site/files/essential-fats/Fish-oil-versus-flax-seed-oil.htm
"The omega 3 that comes from plants is ALA (alpha-linolenic acid), which is then converted by your body into the DHA and EPA. Which brings us to the main point in the flaxseed oil versus fish oil debate: With flaxseed oil, your body needs to take an extra step to convert the DHA and EPA from the ALA using enzymes.
With fish oil, the EPA and DHA are already there. And some people don't even have the necessary enzymes to get DHA and EPA from ALA at all, rendering the flax totally useless. (Women tend to have an easier time doing this conversion.) Even the people who have the enzymes don't have a lot, so sometimes only 10 - 20% or the ALA consumed is turned into EPA and DHA.
So basically, you need a lot more flaxseed oil than fish oil to see the omega 3 benefits
http://www.energyfirst.com/site/files/Health-Benefits-Fatty-Acids.htm to your health. (You probably need about six flaxseed oil capsules to get the same amount of DHA and EPA as you would with one fish oil supplement capsule.)"