One of the most important skills to learn as a tracking engineer is the fine art of microphone placement. Getting a great sound takes a lot more work than just dropping a mic in a room and pointing it at what you want to record.
There can be a lot of variables that shift around from session to session when it comes to pro vocal recordings. The microphone, preamp, position, and voice selection will all switch up depending on the aesthetic of the song.
An often overlooked consideration of a recording chain is the brand of pre-amplifier you decide to use when bringing your signals up to a usable level. I spend just as much time considering this as I do when selecting the microphones I will use.