Don't listen to opinions, go look at results, but remember the grower matters more than the lights.
Look at the light output, the input watts, the cost, and your environment/setup (how much does heat cost you.) If you pick the right color LEDs they will all kick ass, it's all about sizing them right and determining if you want/need the most efficient light or if you are better served with a cheaper less efficient option.
I would size at:
55w SQFT for the most efficient leds
75w SQFT for the cheaper option
50w SQFT for HPS
Note I don't go weak on any of the lights, those all put out about the same amount of usable light.
LED is expensive unless you are willing to DIY. If are willing to DIY look at the Vero, Epistar, and Cree CXA options and decide for yourself based on your needs.