Flax and Chia seeds are superfoods and should be a part of your daily nutrition, but what if your budget or any other reason allow you to consume only one out of these two, then keep the following in mind:
Both seeds contain a good amount of protein and omega-3 fatty acids, although flax seeds have a slight upper hand when it comes to these two nutrients.
Flax seeds also contain significantly more manganese, copper and potassium.
Chia seeds on the other hand contain slightly fewer calories and more fiber, thus a great option if you need to boost your fiber intake without increase your caloric intake. Also, they have more calcium and selenium as compared to flax seeds.
One important factor that chia possesses which almost most plant sources of protein lack is that it is a complete source of protein, that means they contain all essential amino acids.
All in all, they both are highly nutrient dense foods! Try including at least one of them in your daily diet if not both.
If you are a vegan then it goes without saying that these kind of foods are your best friends.