The best replacement for 5g is 2.4g.

The best alternatives to 5g are rated as following:
★★★★★  2.4g
★★★  5.5g
★★★  4g
★★  2.4
★  2g
★  6g
★  10g creatine
★  51d
★  4g iphone
★  4g lte
★  2.4g wireless
  ipod touch 3g
  iphone 4s
  2g router
  ipod classic
  2.4g netgear
  ipod touch 4g
  4g ipod touch
  zune hd

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Scale is based on the average worldwide traffic of 5g in all years. Click on graph for more.