The best replacement for twin reverb is super reverb.

The best alternatives to twin reverb are rated as following:
★★★★★  super reverb
★★★  ac30
★★★  deluxe
★★  deluxe reverb
★★  bassman
★★  deville
★★  pro reverb
★★  hot rod deluxe
★★  hot rod deville
★  jc-120
★  vibrolux
★  vox ac30
★  dual showman
★  65 super reverb
★  vibroverb
  bandmaster
  fender deville
  jazz chorus
  fender deluxe reverb
  fender super reverb
  twin amp
  blues deville
  hot rod
  59 bassman
  marshall bluesbreaker

Your alternative for twin reverb is not listed? Suggest!
Speaking about twin reverb, one probably shouldn't forget about attenuator.

Other search terms related to twin reverb and their ratings are:
★★★★★ attenuator
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twin reverb
super reverb
ac30