The easiest way to get putuoshan from ningbo or Hangzhou?

I am going to visit Putuoshan in this Dec with my 2 little daughters. The first board in Hangzhou,I will spend 3 days in Hangzhou and then go to Shanghai. I search in internet,there are many ways to get Pu tuo shan but I decided to choose two option city, Ningbo or Hangzhou as a depart city to get there. Because I bring my 2 little daughters, can you give the best option to pu tuo shan from ningbo or Hangzhou? And what you recommended to get there by bus or by train? What you recommended hotel area to stay in Pu tuo shan? Is it enough just stay one night in pu tuo shan? Thanks