There are well known and respected brands for keyboard bases, switches and caps. Combining those should yield fine mechanical keyboards with a satisfying level of customization.
I personally am very happy with my combo of Glorious GMMK base, Glorious Fox Heavy switches and Cerakey ceramic keycaps. I ordered some other switches with even more resistance and since compatibility is high for all widely popular components, replacing them should not be an issue.
I honestly don't know why they are not more popular. They feel amazing to the touch, look stunning and give a deep, rich sound. The white ones also diffuse RGB lighting beautifully.
They are quite heavy, though, I would definitely recommend switches with high resistance.