Honestly I am a fan of MH/HPS flowering but I just got a 1000 HPS and will be using it veg to bloom. From my experience and research nothing really beats intense HPS light for big potent buds.
hps causes the nodes to grow further apart... you get more stretch
all mh in the 4000k range through the entire grow is the way to roll....add some lizzard lights to increase trichs