Moving over to a 5 string has a few different moving pieces that sometimes get jumbled together. Assuming you know your budget, I'd recommend the following:
I'd start with the bass geometry and dimensions. When I played 4 strings, I liked 34 inch scale basses with Precision necks (1.75" at the nut was best and 0.75" at the bridge). Most 5 strings I played were too cramped for me - I found the bridge spacing to be even more important than the nut spacing. I also like necks that are wide and get significantly wider as they approach the body. To me, the Lakland 5 string necks ended up being the best fit. Similarly, I'm tall with big hands, so moving to a 35 inch scale was not a big deal, but it may be for others. I also really liked the Dingwall fanned frets - they weren't a problem, but I also didn't see them as a significant benefit. Lastly, how does the bass balance and feel - is it comfortable? Can you get the playability and action that you need? Can you reach everything you need to reach?
Once you have the dimensions and geometries out of the way, then I'd start to think about passive or active, number of pickups, color, manufacturer quality reputation, etc. For example, I think that almost all the Lakand 5 strings have more or less the same neck (at least for the Skylines), so if you like the way an active one feels and plays, you'll probably like the 5 string P or J too.
The last thing, which people usually blame on the bass but it's more related to the strings, is the B string. Based on my experience, most stock B strings are inadequately thick or stiff enough relative to the other 4. The only exception to this was the Dingwall, which had a 37 inch scale B string for a .135 thickness. On my current 5 string, I have a set of balanced Kalium hybrid strings, and the balanced B is .150 (for at 35 inch scale bass) where the G is the typical .045. I like a little more tension, so others may have different opinions as to what optimum thickness looks like. My main point is that it's probably not the bass as much as it's the string that people will dislike the B on a 5 string.