The best replacement for 350 qx is phantom.

The best alternatives to 350 qx are rated as following:
★★★★★  phantom
★★★★  dji
★★★  dji phantom 2
★★  walkera qr x350
★  dji phantom

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Speaking about 350 qx, one probably shouldn't forget about dx6i.

Other search terms related to 350 qx and their ratings are:
★★★★★ dx6i
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350 qx
phantom
dji