Norwegian Forest Cat vs Savannah

This breed is marketed as a hardy, naturally-evolved landrace with few health problems, which is true for most individuals, but it carries a rare fatal metabolic disease that kills affected kittens in infancy or early kittenhood, and Cornell's feline health center also lists it among breeds with elevated hypertrophic cardiomyopathy risk — a DNA test exists for the fatal condition and there is no excuse for a breeder not to use it.

A Savannah is a serval hybrid, and how legal it is to own one depends entirely on the generation (F1 being closest to the wild serval, F5 and later being fully domestic under TICA's standard) and on your specific state and city — some places ban the breed outright, some allow only F4/F5, and a cat that's legal to own in your state can still be banned in your city, so buyers must verify both before they buy, not after.