The best replacement for posb is dbs.

The best alternatives to posb are rated as following:
★★★★★  dbs
★★★  ocbc
★★  dbs bank
★★  uob
★  oub
  dbs better
  dbs banks

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Speaking about posb, one probably shouldn't forget about dbs.

Other search terms related to posb and their ratings are:
★★★★★ dbs
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posb
dbs
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