Which piezo sensor for MIDI drums?

Hi!

I want to build MIDI drums with Arduino Nano V3 and 4051.

Which is the best piezo for it? I can choose between:

  1. 6,5KHz 500 Ohm
  2. 3,6KHz 500 Ohm
  3. 2,5KHz 500 Ohm
  4. 5,8KHz 500 Ohm

Thanks!