At the moment black over blue works best. The Strike King Blue with a little purple works well.
The little suspending X-Rap is tops for this in blue over black. Also the Blue Onda Onda works well. These lures troll nicely at faster speeds which works well 6-9km/hrs
Also troll the blue/white small Williamson feather for the Snoek, trolled at 9-12km/hr
Best spots for snoek are in front of Virgina Aiport North and Whaling Station South.
To answer you question, Blue coulors with black have been working best lately.