Sorry, this answer will not satisfy you, but it is the most honest, accurate one I can give you.
It’s the brushes you feel comfortable with.
There are artists who use only one or two brushes, others use masses of brushes, and still they achieve the best results, at the same technical level. Just take the Krita brushes in turn and try them out. Find out if a brush suits you, play with them.
I recently, on an unfinished painting, painted an entire mountain with a brush that was intended by its creator for rippling water surfaces. I used it to paint both the rock structures and snow, only adjusting size and opacity as I painted. At that moment, it was the best brush I could imagine for it. I think you understand what I’m trying to tell you with this, don’t you?
But just to give you a few worthwhile sets anyway: When it comes to watercolor, @Pesi’s and @Jack_The_Vulture’s bundles are tops. For pencils and colored pencils, no one can get around @RamonM’s SK1 & SK2 bundles, they are the benchmark. Also great for sketching is the “Jarry H. Line Brush Set” this is the DOWNLOADLINK. @emilm made an absolute stroke of genius with the “Rotating light brushtips”! For concept art (and more), I think the bundles from @fizzyflower and @Rakurri are genius. Also recommended, the bundle of @Odzuki, best read through the whole topic, the brushes are described and partly demonstrated there!
And with the equally excellent brushes that Krita comes with by default, you now have even more confusion at your disposal than before, with many (most?) coming from @Deevad. You find his 2023-Bundle here, by the way.
I apologize now to all those I have not mentioned, although they deserved it, but it must also have an end.
@sooz, very good idea!
Michelist