Travel: Milan to Paris 米蘭去巴黎

Our family(with 2 kids) want to take a holiday in Italy for a week or so.
Then we want take off from Milan to Paris and spend a few days there.

Want some expert advise- which is the cheapest way for us to get to Paris?

Budget airline(which one) or rail?

Thanks

請高人指點,

如果成家(2隻化骨龍)想去意大利一星期跟隨去巴黎。
請問由"米蘭到巴黎"-最平(安全)可以點去？

廉價機票或是火車？

Thanks