My first adventure down the font hole started with Bit Stream Vera Sans Mono followed by Source Code Pro. Stuck with Source Code Pro for many years and even today, not sure any other aliased font looks and works as well as Source Code Pro at almost every size, from the smallest onward. It just looks clean to me.
After reading on here how great it was, switched to Fira Code for a while. It was nice, but never blew me away. The ligatures were a nice change I guess.
Then I tried out Iosevka and was happy. Kept using it for a while.
Then it was Input Mono, again happy and used it for a while.
I was later introduced to Operator Mono and thought I had found code font bliss (pay).
Ended up going back to SF Mono (I'm on macOS) and feel content. Finally. Again. I don't think I'm switching anymore. I might try for a day or a few minutes something else, but I can't see myself sticking with it like SF Mono. It will have to blow my mind.
As an aside, I love no antialias Monaco at about 10 pt on hi dpi/retina displays (MacBook Pro 2017 and LG 5k with non-decimal scale, e.g. 2x). Something about it seems perfect to me. It usually seems to require special configuration and sometimes is difficult or not supported at all in many tools and editors, so I have stuck with SF Mono, typically 11 pt or 13 pt depending on the display and time of day and how much sleep I got.