The Keychron brand was what I decided to go with. It had a reputation among the community as the sort of "golden standard" but had some quality control issues. While I did think about buying from Royal Kludge, I wanted something more premium since Royal Kludge was a sort of "budget" brand.
There were 2 products that Keychron focused on, the Q series and the K series. Then there were also variants of it, such as the Q pro and K pro. The Q and Q pro series were the flagship products of Keychron and had the prices to match that, which made me opt for the K lineup. When deciding between the K and K pro, the 2 main differences between the two were the aluminum frame and the ability to reprogram the keyboard with QMK/Via. The ability to reprogram the keyboard made me interested in the K pro series.
The size of the keyboard was a bit hard for me to choose. I first thought that I didn't need a numpad for now. Then I had to decide whether I used the full navigation keys (print screen, delete, page down, etc). Afterward, it was down to the function keys, which left me with the K2 or the K6. Unfortunately, the shop I was going to buy from didn't have the K2 which made me get the K6 pro RGB.