It all depends on what goals you have.
In general there are two flavors of flats: traditional (think Motown & Stax), and modern. The traditional sets tend to have a darker sound, while modern sets are a bit brighter.
Looks like we have similar baselines-- my go-to strings for decades have been nickel wrapped rounds. To my ears, many of the modern sets remind me of nickel rounds that have worn in. Flats I find fit that description are:
*Note these are 45-100, and cost roughly $30 - $40
- Fender 9050
- D'Addario Chromes
- Ernie Ball Group III
Tension and feel:
The tension of these strings isn't very perceptible to me. However, the feel is different between the two; frankly I find the flats to be easier to fret.
Then of course there is the feel of the flats under your fingers-- flats are smoother than rounds, but I've never found nickel rounds to feel
bad... the flats just feel smoother, and I like that too.
Sound:
Flats can tame a bright/brittle sounding bass.
Flats can be used to rock just like rounds do
(think Steve Harris).
Erine Ball Cobalt Flats are among the brightest sounding flats. Super helpful if you have a dark sounding bass and don't want to use stainless steel rounds which have a harsher feel under the fingers than nickel rounds, or flats in general.
Flats tend to have a wider spectrum of tone than that of rounds, at the expense of brighter highs.
For a guy looking to step into the world of flats for the first time, I'd suggest installing them on your P-bass and going with one of the three listed above. Between the three, I'd say the Chromes are a tad brighter than the Fender & Ernie Ball Group IIIs. That said, they sound very close, so I'd go with the least expensive of the three you can find. Availability is also a trick these days
Quick notes:
- Each of the three sets I mentioned can be strung through the body
(some companies/sets recommend against it). Stringing through the bridge
(not the body) can present some problems with the silk wraps at both ends of the string-- depending on the specific bass you're working with.
- Be sure to bend the end of the string before cutting it to length. This helps avoid various problems with the wraps. It's also good practice when using rounds, as recommended by DR Strings. Doing so works quite nicely with the Fender tuners.
Here's how I treat the strings when installing:
View attachment 4640552
The extra step in the second photo makes removing the string easier when necessary.
Stringing the Fender 9050 through the body results in the silks lining up like this:
View attachment 4640553
If instead you go through the bridge, the silk ends will be closer to the tuning keys
(may even begin to wrap around), and you'll likely have to trim some of the silk from the E string to keep the silk away from the bridge saddle.
Best of luck in your search & enjoy the adventure!