The best replacement for cdx is osb.

The best alternatives to cdx are rated as following:
★★★★★  osb
★★★  plywood
★★★  osb plywood
★★  ac plywood
★  cds
★  acx
★  ccx
★  rtd plywood
★  osb sheathing
★  bc plywood
★  marine plywood
★  pioneer cdj
  ccx plywood
  cdj 1000
  gsi
  osd
  cd plywood
  rtd
  baquacil
  technics sl dz1200
  advantech
  dn s3500
  osb roof sheathing
  x eye

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Speaking about cdx, one probably shouldn't forget about 32x.

Other search terms related to cdx and their ratings are:
★★★★★ 32x
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Google Trends

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cdx
osb
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