The best replacement for newtonian is dobsonian.

The best alternatives to newtonian are rated as following:
★★★★★  dobsonian
★★★★  cassegrain
★★★  quantum physics
★★★  quantum
★★★  sct
★★★  schmidt cassegrain
★★  refractor
★★  non newtonian
★★  dobsonian telescope
★  quantum mechanics
★  einsteinian
  non-newtonian
  cartesian
  newtonian
  schmidt newtonian

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dobsonian
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