Freshly pressed oil and not something on a shelf is good if you are pressing yourself and seeing exactly what is being put in the bottle. Now how do you press yourself reasonably. The price is quite high so many will resort to local companies.
Concentrated oil is what is used for ease of use but good quality seeds are better as they are in their natural state and ground fresh. It comes down to preference. But how can fresh ground oil be better than the seeds that they are ground from?
Now here is the trick knowing which seeds to purchase. Never buy carraway seeds as they are different than nigella sativa. They come from two different flowers.