"I am asking this because I am probably going to have to get a newer (or new) MacBook Pro soon, and I want to get a sense of which OS is the most hassle-free."
Be aware that if you buy a new one, it's most likely going to come with Ventura, and you won't be able to install and run anything earlier than that.
The "first release" 2021 MacBook Pro 14" and 16" came with Monterey, which is very smooth and stable. I have it on mine and so far have no desire to upgrade to Ventura (or anything beyond what's there now).
Be aware that if you buy a new one, it's most likely going to come with Ventura, and you won't be able to install and run anything earlier than that.
The "first release" 2021 MacBook Pro 14" and 16" came with Monterey, which is very smooth and stable. I have it on mine and so far have no desire to upgrade to Ventura (or anything beyond what's there now).