The best replacement for ginger ale is ginger beer.

The best alternatives to ginger ale are rated as following:
★★★★★  ginger beer
★★★  sprite
★★  club soda
★★  7up
★  ginger soda
★  tonic water
★  cola
★  diet ginger ale
★  7up for upset stomach
★  sparkling water
★  vernors
★  ginger brew
  ginger tea
  coke calories
  canada dry
  7 up
  dry ginger ale

Your alternative for ginger ale is not listed? Suggest!
Speaking about ginger ale, one probably shouldn't forget about alcohol.

Other search terms related to ginger ale and their ratings are:

★★★★★ alcohol
★★★ bitters
★★★ rum
★★ most ginger
no high fructose corn syrup
You have in mind a companion for ginger ale and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of ginger ale in all years. Click on graph for more.
ginger ale
ginger beer