I bought a 5-string after learning bass for 3 months. I've been using it for a year and I'm still not comfortable with that B-string. One reason I play a five string is using the lower register. The only reason I wouldn't wanna play a four string in church is because the key of Eb xD and having no extra low-end isn't good for the band/sound. I'm think of tuning my four-string down to Eb or D, but things would easily get out of tune with normal gauged strings.
So right now, 4-string every time I can, but for main services, I would definitely go for a five-string!