I haven't seen too much Granlund, but have seen an OK amount of Burmistrov and Johansen. Personally I'm highest on Johansen, think he's gonna be a really good 2-way C in the NHL, but obviously it's a bit early to say. Granlund is super talented with the puck, and you have to love his compete level, but he's quite undersized (especially if people are projecting him as a C), and and not as blazingly fast as many other NHL midgets, I'm not quite as high on him as some other people are. I think he's got 1st line potential, but not as sure he'll reach it as I am that Johansen will.
Johansen has a really great, well rounded game, he's got great size, high end puck skills/hands, real good hockey IQ/vision. Could stand to bulk up a bit, could be a bit more physical, and more of a good than great skater, but for the most part I just love his game and have been very impressed by him. I like the Spezza comparisons, and I really think the Jackets are gonna be set at C for a long, long time with the Johansen/Carter combo. Not sure there is a single drafted prospect who I like significantly more than Johansen.