The best replacement for tbs discovery is qav400.

The best alternatives to tbs discovery are rated as following:
★★★★★  qav400
★★★★  dji phantom
★★★★  dji f450
★★★★  dji f550
★★★  qav500
★★  f450
★★  flip fpv
★  f550
★  qav
  ht-fpv

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Speaking about tbs discovery, one probably shouldn't forget about apm 2.5.

Other search terms related to tbs discovery and their ratings are:
★★★★★ apm 2.5
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tbs discovery
qav400
dji phantom