Litang is not recommended, although it is much closer than Batang, but the climate is too bad. Litang county is more than 4000 meters above sea level, and some mainlanders will have altitude sickness, which is cold in winter.
Batang is good, the climate is very good, and it is the best in Ganzi South Road. Don't worry about traffic. Now Ganzi's road is at least the asphalt road leading to the county seat (some are already cement roads), so don't worry about traffic.
It should be no problem to open snacks, and it is also suggested that selling dry goods is still feasible.
You can look at the situation of each county on Baidu Encyclopedia, which is a bit.
Chengdu to Kangding (one day)
Kangding to Litang (one day)
Litang to Batang (one day)
I have my own car. It takes two days at most from Chengdu to Batang.
I also work in Ganzi Prefecture, and there are other things. Hi, contact.