Not running BSD, but Linux, but I guess the same applies - I try to get the most boring laptop possible, from either Dell or Lenovo. My advice is to go for laptops designed for corporate use - they won't get creative with GPUs and other usual sources of pain and distress. Going for new-ish but not bleeding edge CPUs is also wise, as it is going with integrated GPUs (those have a lot more exposure to developers). While some new chips (such as AMD's Strix Halo) have good support, YMMV).