The best replacement for corn snake is ball python.

The best alternatives to corn snake are rated as following:
★★★★★  ball python
★★★★★  king snake
★★★★  copperhead
★★★  milk snake
★★★  coral snake
★★  rat snake
★★  bearded dragon
★  python
★  hognose
★  leopard gecko
★  garter snake
★  royal python
  rosy boa
  sand boa
  red rat snake
  boa
  copperhead snake
  crested gecko
  gopher snake
  prairie kingsnake
  feeder mouse
  ball pythons
  kingsnake

Your alternative for corn snake is not listed? Suggest!
Speaking about corn snake, one probably shouldn't forget about ball python.

Other search terms related to corn snake and their ratings are:
★★★★★ ball python
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corn snake
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