Go for the Dektol if you find it. It's less expensive and just as good, if not better than, the Ilford stuff. I've used Ilford's Bromophen, which is similar to Dektol, and didn't like it too much. I'd never even consider using a premixed liquid concentrate for this application. They offer nothing more than the convenience of not needing to mix up the dry powder with water that is free from your tap. All that stuff is terribly overpriced, IMO, and has a very short shelf life compared to dry chemicals. Remember that liquid concentrates are still mostly water. Water is heavy. The product must be shipped, and shipping costs money.