Absolutely not, there are no research that proves the Bio food is better in quality than the non-bio. There is no difference in the nutritive value of both categories. There are also some discussions stating that, the Bio food are rich in taste and last longer than the non-Bio food. But again, there has been no proof. So, it won´t be wrong to say, non-bio food can be just as fresh, healthy and tasty as the Bio food.
The matter of fact and the difference in the two categories is only in its process of cultivation and how it works on the environment. But that doesn’t cause changes in the final product. They carry the same nutritive benefits. So, choosing Bio over non-Bio just under the impression that it is healthier and fresher, is not actually true. Bio surely is expensive than non-Bio, and that is true, as it takes a lot to get a food product labelled as Bio. Buying Bio could do some good to the nature, but not all have that luxury to always prefer the Bio food products.
If your only concern is to have healthy food, then it doesn’t matter what you choose between the Bio and non-Bio. But if you wish to do better for the environment and help local farming with no intention of personal gains, then you can certainly opt for the Bio food as it helps actively supporting sustainable agriculture and environmentally sound farming methods and since many Bio products come from local farms you are also supporting local business and strengthening the local economy