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The top two are drip and the second is aeroponic. Aeroponic is theoretically the quickes/best. If you don't know about the different systems check out the book Growing marijuana hydroponically by Hans. Get it at amazon.
The last system also has a 17 gallon tank which is bigger/better.
Both come with nutes, which is good. You will need to get a pH and PPM meter which none come with.
You say you are getting back into the game? You grew in soil?
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