Which is easier to learn or to speak like , American English or British ?

I personally like British and what I like will ease to learn or practice it usually

I believe that the best way to do so is listening to English music and radio as well as watching movies with English subtitles and reading books and online resources.It would be also helpful to develop your vocabulary which will contribute to developing a semi-native way of expression 

There's not much of a difference between the two as regards syntax and lexis, except a few differences that the Americans spell their words with. But as regards pronunciation, there are differences as American English is less accented than British English. But once again, regional differences exist in both American and British Englishes, for example, a man from the west America may sound weird compared to a man from an eastern city like New York.

So, one cannot say that this language is easier to learn compared to that; the only ease comes form the fact what is around you; We are surrounded by American English (my laptop tells me I am wrong if I spell colour because it is fed with American English!) these days, so it would be easier to accommodate it in life and learning too, I suppose.   

I think British is easier than American 

There is not too much difference in these two except spellings. Although American spoken English is getting more popularity but that is mostly confined to slang. Standard Academic English is still British. 

As for as your question is concerned, for a non English speaking person both need the same effort to learn. Anyhow to avoid confusion and intricacy in the process of learning one should follow any one of the two.

Both are similar in a level of hardness