They all have their pros and cons. I like the 1000w epap more than the gavita, it has less downward heat but the gavita is still very good. The parabolics give me a nice spread and little heat but not as much penetration as the adjustas. 1000w gavs and epaps are better than my 1000w adjusta but really I don't think there is anything wrong with 600w adjustas. I know I haven't answered your question very well but I like them all, it just depends on the room, height of plant, time of year etc. horses for courses, results are about the same.
My friend uses 4x250w lights where I would use 2x600w and he does very well.