here are some of my blue varieties
clockwise:
2 Amethyst jewel, 1 P20 x Beauty King, 1 Ananas bleue, 2 Yamali blue little green, 1 Stripes of Yore, 2 Amethyst Cream
my tastiest blue variety was Muddy Waters, followed by Stripes of Yore who unfortunately is a very poor producer. Ananas bleu is also very good.
Best blue cherry is Amethyst Cream, very sweet.