The best replacement for pioneer is alpine.

The best alternatives to pioneer are rated as following:
★★★★★  alpine
★★★★★  kenwood
★★★★  denon
★★★  onkyo
★★★  panasonic plasma
★★★  sony
★★  kicker
★★  yamaha
★★  jvc
★  kicker subs
★  panasonic
★  numark
★  pioneer elite
★  frontier
★  yamaha receiver
★  kenwood double din
★  yamaha receivers
★  ranger
★  rockford fosgate
★  premier
  sony receiver
  denon receiver
  marantz
  denon receivers
  kenwood car stereo
  sony speakers
  polaris ranger
  monsanto
  jvc head unit
  kicker speakers
  kenwood navigation
  alpine speakers
  sony receivers
  yamaha viking
  jbl
  alpine which is better
  eclipse
  alpine head unit
  jvc car stereo
  follower
  jvc which is better
  harman kardon
  sony car stereo
  elite
  viking
  alpine car audio
  yamaha av receiver
  panasonic plasma tv
  pioneer
  settler
  fujitsu

Your alternative for pioneer is not listed? Suggest!
Speaking about pioneer, one probably shouldn't forget about steering wheel control.

Other search terms related to pioneer and their ratings are:
★★★★★ steering wheel control
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Google Trends

Scale is based on the average worldwide traffic of pioneer in all years. Click on graph for more.
pioneer
alpine
kenwood