many people will mirror this sentiment, but for those of us that have always played a 5 (or have done so for a significant amount of time) a 4 string is actually slower. i cant make heads or tails of a 4 string bass, personally.
what it comes down to is preference. you can get the job done either way. the only REAL limitation is not being able to play more than 4 notes at a time. and who does that?
Manring lol