The best replacement for roth 401k is roth ira.

The best alternatives to roth 401k are rated as following:
★★★★★  roth ira
★★★  401k
★★★  traditional
★★  traditional 401k
★  ira
★  pre tax
★  regular
★  traditional ira
★  after tax 401k
★  regular 401k
  post tax 401k
  before tax
  pre tax 401k
  sep ira
  after tax
  traditional 401
  traditional what is better
  standard 401k
  tax deferred 401k
  roth 403b

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Speaking about roth 401k, one probably shouldn't forget about employer match.

Other search terms related to roth 401k and their ratings are:

★★★★★ employer match
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roth 401k
roth ira