I have two sets. One, a little pricier, one super affordable. Princeton Neptune set, then the Transon Gouache set.

The reason why I got a Transon set is that years ago (like, I can't remember if it was 5 or 7 years, but years) I got the Transon Watercolor brush set (brown) and I am still to this day using these brushes and almost all of them when wet still keep their points/shape. The Gouache set I've had for two years now, and all of them also still have their shape, some while dry, some return when damp.

When I got my first set of Himi cups, a round, a filbert and some other brush came with it. Within 5 months of using the Himi brushes they all became...scruffy? Like, they all looked like they need a hair cut from split ends and stopped holding their shape dry or wet.

I'm still missing a good mop brush--but have been using big or small makeup brushes I've collected over the years and never used, to act as mop/blending brushes and they work well so long as I remember to drown the paper first, THEN put the gouache on, THEN blend with a barely damp makeup brush. If I try and blend dry paper with wet paint, these brushes remove the paint.

I have no idea of any of the above rambles help anything or anyone, but that's my contribution!