I have both. They are both fun to play. I have many of each. They are all fun to play.
Although when I gig there are certain songs that I prefer to play on a banjo uke, I will play anything, on either one.
...and no one has complained yet.
Saying "if you want the banjo sound, get a banjo" is exactly like saying "if you want that smooth, velvety sound, get a classical guitar instead of a uke."
Try them both. I have over 20 instruments, and they all sound, feel, and play differently. And I have no plans to get rid of any of them.
Years back, I went to Magic Fluke in Sheffield, MA. In the 4 hours I was there, I played every uke they had in stock, and both of the prototype Firefly banjo ukes. I bought a tenor that was a 2nd, and ordered a Firefly (they weren't shipping them yet).
Make up your own mind, don't take anyone else's word as to what you have to do.