5 piece vs 7 piece neck

[Jason Wilson]

Hi everyone
I have been advised there is a difference in sound between a 5 piece neck & a 7 piece neck, so now I do not know what I should get. What is the right sound for me?
There are no Ken Smiths basses here in New Zealand for me to listen to to compare the sounds, so I would like to ask all of you for help.
Can someone please advise the what the difference in sound is between the 2?
I like a real grr to my sound, play a lot of slap and faster runs, want a tight low B, will the number of pieces in the neck make a difference to any of these??

Please help.

Cheers
Jason