The best replacement for cassegrain is newtonian.

The best alternatives to cassegrain are rated as following:
★★★★★  newtonian
★★★  reflector
★★★  gregorian
★★★  maksutov cassegrain
★★★  refractor
★★★  newtonian telescope
★★★  dobsonian
★★  newtonian reflector
★★  schmidt cassegrain
★  maksutov
★  dobsonian telescope
  schmidt newtonian
  schmidt-cassegrain

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cassegrain
newtonian
reflector