It's a personal choice so rather than tell you what you should do, I'm just going to list a few benefits of each. Brief note to beginners: a 5-string is the same as a 4 but it has an extra string on the low end that drops to a B note.
1. The clear advantage of a 5-string is the expanded range. That low B string really adds some bottom. It also helps you get beneath a keyboardist who is playing heavily in the mid to low range. There's nothing worse than a keyboard player trampling all over your notes.
2. More is, well...more. If you feel comfortable on a 4-string it makes sense to expand to 5. It just gives you more options and options are good when you know what to do with them.
3. The tension on the strings of a 5-string actually affects the sound. Whether you consider that a positive or negative is up to you. Of course, you never want to purchase a bass without playing it first.
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1. Keep it simple. A five string can give you more options than you are ready for causing you to muddy up the mix or simply play too busily. Beginner and intermediate players can really benefit from sticking to a four string for this reason alone. If you are focusing on modern worship, you'll have rare moments when you miss out.
2. Having only four strings encourages creativity. What do you do when you can't hit that low B? Fewer options can force you to think outside the box and grow your mastery of the bass.
3. It was good enough for The Police, Motown, and U2. Enough said.
At the end of the day, it's all about preference. If you are just starting out, I'd stick with the 4-string. Even after a lifetime of playing I still prefer it and in lessons that have a 5-string bass, I will still show you what to do it on a 4 so you'll never be out of luck. If you haven't signed up for bass lessons on Worship Artistry yet, you should. Sign up here. Now a question to you: what do you prefer and why?