I really like RDWC too. I ran it for several years, started having root rot issues I couldn't fix and switched to soilless. Now I'm in the process of switching back.
You will get amazing results in RDWC if you keep your roots clean of pathogens. I haven't worked with ebb and flow but I suspect DWC is a bit more difficult in that regard, just meaning that certain things need to be done to prevent root issues. Specifically bleaching everything in between grows and using a root inoculant. I've had bad results with various powders which may have been due to other poor cultural practices. I'm using a liquid inoculant called Hydroguard ATM and roots are very clean. I'm currently running a chilled and a non-chilled area. Both are doing great and believe it or not the water without chiller get's over 80F during the day. Without the Hydroguard that wouldn't work at all though. Main advantage of the chiller at this point is increased oxygen levels. I'll eventually have all my cultures running at 65F.
As far as yield, I suspect grams per square foot has similar potential. One advantage is being able to use fewer plants with large root balls. 3 week veg can result in plants during bloom taking up well over a 2x2' footprint. I haven't tried but suspect with a 4 week veg a single plant could fill a 4x4.
Because of the large plant size SCROG becomes more appropriate, which could be considered a disadvantage. I imagine SOG is a bit easier to trim.
Day two with my new setup. The insulating material is called reflectix, easy to work with... folds up like a Chinese takeout box.
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