The best replacement for p6 is p225.

The best alternatives to p6 are rated as following:
★★★★★  p225
★★★★  p3
★★★  p239
★★★  pink magic
★★★  p6 black
★★★  microsoft project
★★  t bomb
★★  test freak
★★  a-hd
★★  animal stak
★  animal test
★  p7
★  test x180
★  p7 pirelli
★  g700
★  ms project
★  225
  syntheroid
  androbolix
  p4
  t bomb 2
  p5 acca
  p2
  x-180

Your alternative for p6 is not listed? Suggest!
Speaking about p6, one probably shouldn't forget about m5.

Other search terms related to p6 and their ratings are:
★★★★★ m5
You have in mind a companion for p6 and it is not yet here? Propose!



Google Trends

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p6
p225
p3