Hey ,
Sunflower lecithin is used to make the vitamin C liposomal. Since soy lecithin is often made from GMO soy, the sunflower choice is better since it is often not GMO. Dr. Mercola claims to be GMO free by the way, so with regard to that, you have made a good choice.
I often recommend to reduce yellow oils and have a rich diet in anti-inflammatory fats like Extra Virgin Olive oil and Omega 3 fats.
It is ok to have some good quality organic omega 6 fats in the diet that are used when inflammation is needed to heal the body, but it should be in balance with the amount of anti-inflammatory fats. If you don’t experience inflammatory problems and your diet contains mostly olive oil, fish (or fish oil… or algae oil) or other anti-inflammatory products, you will be fine!