If 4 strings are great, then 5 strings have to be even better, right? It's solid logic, and since you're looking at 5 string sets for electric bass, it stands to reason you're on board with it. Whether you're searching for an upgrade from factory strings on your first extended-range bass, or you're a seasoned 5-string axe player interested in feeling out a brand-new sound, there's certainly something great just waiting for you to find it here. All you need to do is figure out what that could be, which might come down to playing feel, tone, reliability or something else altogether - there are strings here ready to satisfy on those fronts and more.
For bassists who like their strings flexible, Ernie Ball's Slinky series has always been one of the best performers. And since they come in tons of varieties, including the Ernie Ball 2821 Power Slinky, 2736 Cobalt Regular Slinky and 2816 Slinky Flatwound 5-String Bass Strings, it's easy to find a set that delivers exactly the sort of character you want it to. That's true for most of the other brands as well, including D'Addario, Dunlop, Rotosound and more - they all bring a wide variety of strings to the table, so if you haven't found your ideal set under one label, try taking a look at the others to see if they've got a better fit.
Maybe that perfect set of strings for you is going to be a really exotic one? For instance, if stage presence is your top priority, strings like the DR Hi-Def NEON Multi-Color Coated Medium 5-String Bass Strings will literally have you glowing onstage. Or, if you're a practical-minded bassist wanting the feel and durability of coated strings with the pure sound of uncoated, check out Elixir and Cleartone: their super-thin coatings are legendary for delivering the benefits of coated strings with tone that's just like an uncoated set.
There's nobody who can tell you for sure which 5 string sets for electric bass are the best options for you - the best we can do is to make recommendations. The final choice will be yours to make, based on your own personal tastes and which strings turn out to be the right fit for your instrument. It will probably take some experimentation and trying out a few of the strings that appeal to you before you find the perfect set, but once you have, it's safe to say you'll know it!