I keep and breed both species, and between the two I'd say there is not a real difference in breeding. However, in my experience the Taiwans tend to be a better adult pet. It is more common for the Blues to get feisty and/or nippy as they get older. Also, the Blues tend to be trickier to get to eat as hatchlings. I've had to tease feed some blues for their first 8 or 10 meals and had to use live food for some. All of the Taiwans I've bred have eaten f/t right out of the egg, most with no teasing. If they did need to be teased, they ate without teasing after their first meal. Other than those small issues, they are very similar snakes. Comes down to what color you prefer.
Bryan
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Last night I was laying in bed looking up at the stars in the sky and I thought to myself, "Where the hell is my ceiling?"