I chose a Stimson's as my first snake after 25 years of not keeping snakes and, 3 months later, I am still very happy with that choice. I'm not convinced that a Pygmy python (Antaresia perthensis) would be a good choice. If you live in a state where it can be licenced, you may have difficulty finding one for sale, it would be very expensive for a first snake and, because not many are in captivity yet, quality husbandry and veterinary advice and assistance might be harder to find than for a Stimson's.