I use both whipped loop a la Kreh/Sosin and also braided loops. For inshore work I prefer the braided loop since they make a smoother connection which is helpful when using longer leaders up to 20 ft. However, I don't trust the plastic sleeves or store-bought loops. They're easy to make from 30lb braid and I always whip the braided loop connection using the same spinning bobbin technique.
For offshore / bluewater situations I would go with the whipped loop since there's a risk of the plastic coating being stripped from the flyline using a braided loop. The initial surge from an ocean speedster can do as good a job on the connection as a pair of wire strippers!