I am sure that most of what I am about to say simply repeats stuff in other threads about this topic, but I'll say it here anyway in case someone doesn't want to hunt down those other threads.
I have gone the fishing line route with a lot of my string changes over the past few years. There are only so many manufacturers of fluorocarbon monofilament in the world. I suspect that a *lot* of the fluorocarbon ukulele "strings" that you buy with different labels on them are actually just re-branded fishing line from one of the big makers. Seaguar makes a very good, very consistent, product and that is all you really need when you are trying to make ukulele strings. (Please note that I can't speak for Seaguar when used as an actual fishing line as I don't really fish...)
The recipe I use is taken from (I think) Baz, of Got A Ukulele fame:
Soprano/Concert
G - 40 lbs
C - 60 lbs
E - 50 lbs
A - 30 lbs
Tenor
G - 50 lbs
C - 80 lbs
E - 60 lbs
A - 40 lbs
These are all high-G, by the way. I don't have fishing line for low-G. I generally use a Fremont Soloist for my low-G needs.
I have tried both Blue Label and Pink Label. I feel they both sound and feel *pretty much* the same, and the string diameters (as reported by Seaguar) are virtually identical (see note below on this point.) I slightly prefer the Pink label, because I like the slight pink color. Some folks claim to hear a difference between the two, but I haven't really done a rigorous test of this, so I can't say for sure.
As of this writing (01 April 2022), you can get the full set of these strengths in 25 yard spools of Pink Label on Amazon for about $70 for Soprano/Concert or about $80 for Tenor. Since you have 25 yards of it, you can get somewhere around 35 to 45 string changes (depending on scale length and using real back-of-the-envelope math.) That works out to around $2 per string change.
If you are someone who has only a couple of instruments and leave your strings on for years at a time, it probably doesn't make much sense, but for me it's great. I have a *lot* of ukuleles, I prefer flourocarbon strings, and I change strings pretty regularly.
NOTE: On the diameter of Blue vs. Pink diameters: the spools I have don't quite match, but I think it may be an error in labeling. Here are the diameters of all the Seaguar Blue Label strings I have tried, in inches/mm:
Lbs inches / mm
20 0.016 / 0.405
30 0.020 / 0.520
40 0.024 / 0.620
50 0.026 / 0.660
60 0.029 / 0.740
80 0.032 / 0.810
(I bought the 20 to try a "low tension" recipe by dropping everything down 10 lbs. I didn't like it. Too low tension...)
My Pink Label spools match *except* for the 40 Lbs. They are labelled as 0.022 inches / 0.620 mm. But if you convert 0.620 mm to inches, it is (within rounding) 0.024 inches like the Blue Label claims. I tried comparing the Pink to the Blue with calipers, and they are identical to within the accuracy of my calipers, and much closer to 0.024 inches than 0.022 inches. So I assume that the "0.022 inches" on the Pink Label is an error and they are 0.024 inches just like the Blue Label claims.