The best replacement for ebb and flow is dwc.

The best alternatives to ebb and flow are rated as following:
★★★★★  dwc
★★★  aeroponics
★★★  drip
★★  nft
★★  flood and drain
★★  deep water culture
★★  drip system
★  continuous flow
★  bubble bucket
  top feed
  bubbleponics
  aeroponic
  top drip
  recirculating dwc

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Speaking about ebb and flow, one probably shouldn't forget about hydroton.

Other search terms related to ebb and flow and their ratings are:
★★★★★ hydroton
★★★ smart pots
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ebb and flow
dwc
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