There are many people in this thread recommending cherry mx red/brown/blue. There are also as many stating mechanical keyboards are not for them, often referring to same switches.
Those that would like to explore a bit more, in the custom keyboard world the aforementioned switches are mostly considered starters. More popular, people use switches like Gateron Black Ink V2, Alpacas, Tangerines for linear. U4T, Zealios, Kiwis for tactiles. And about 100 different alternatives available based on taste [0].
Combined with a more premium quality board that fits your typing angle and keycaps in a profile you like (you have cherry profile but also KAT, KAM, DSA, and many more to fit your liking) it may differ considerably from pre-built options.
Not saying it will be for you, but discarding mechanical keyboards on base of what the pre-built market offers is not the best measure of things. It is like saying you hate scissor switch keyboards because you typed on an Acer laptop once.
P.s. Be careful as you will quickly learn topre keyboards are not that expensive.
[0] https://www.theremingoat.com/ - popular switch reviewer