That has nothing to do with the instrument itself, but more about what the player is comfortable with. That's a different question (i.e., are some guys more comfortable playing a 4 string or a 5 string?).
There are a lot of guys who don't want to deal with the more complex muting issues of that 5th string when slapping, etc., and that is totally legitimate. And, of course, every bass sounds different, so directly comparing one of each configuration, even if spec'd similarly or identically, can result in hearing the basses sounding a bit different. This again, IMO, has little to do with the extra string when you compre the tone and performance of the 4 strings that the basses have in common.
Interesting perspective!
However, Paul did mean that the difference was in the tone, not in the feel of the instrument. Here's the excerpt from the interview I mentioned.
"JamiroTalk.net: Do you have preference between 4 or 5 string bass’?
Paul: I do think 4s usually sound better. The E on a 5 doesn’t sound as good. Period. However I like playing 5 and enjoy having the option of the extra range of low notes without detuning."
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