This is the nutritional profile comparison:
*Please note that the caloric difference between Flaxseed and Chia/Salba is due to the fact that Flaxseed has 1g of monounsaturated fat and .5g more protein than Chia/Salba. Please remember that monounsaturated fat is an EFA and is GOOD for you. In addition, it has been proven that a diet high in protein will keep you fuller longer.
As you look at this chart you should notice that Chia/Salba and Flaxseed have a very similar nutritional profile. They both contain similar amounts of Omega 3, 6, and 9 EFAs as well as fiber - the two main reasons most of us consume either product.
The main difference between the two is the price per serving. Here is a comparison of the price per serving of a couple different brands of Chia/Salba and ground flaxseed:
*It is best to purchase whole flaxseeds and grind them at home using a blender, magic bullet, coffee grinder (devoted to seed grinding), or food processor. Oftentimes, pre-ground flaxseed can become rancid in the store.
As you can see, the difference in price per serving between Salba and Bob's Red Mill Ground Flaxseed is $0.44 per serving, which adds up quickly. If you consume 1 serving per day, the difference is $13.20/month.
Also, remember that whole and ground flaxseed is available in the Bulk bins of most grocery retailers. There you can purchase Flaxseed for deep discounts. Chia/Salba is starting to pop up in the bulk bins of some retailers, but is still difficult to locate and more expensive than flaxseed.
Overall, if you are a budget-conscious shopper, Chia/Salba is not nutritionally worth the extra money. However, if budget is not a concern, I would recommend trying Chia/Salba seeds because they have a really cool texture when soaked in liquid.