I should consider the following factors:
(1) Graphical User Interface, GUI. Mingming has told me that this is not a problem since ios also supports GUI and he says there is no difference. 
(2) The hard drive should be at least 512 GB.
(3) I enjoy some window's software very much, such as everything. I have checked all software in "程序与功能" in "控制面板" on Oct 1, 2018. There is no need to check again. Is there such software in ios?
(4) Operation: Are there any differences in the storage of movies, intalling software?