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If I had to choose between learning American English (AE) and
 British English (BE), I would choose AE. This is because AE is
 the more widely spoken variety of English, and it is also the
 variety that is used in the United States, which is a major
 economic and cultural power. Additionally, AE is generally
 considered to be more informal and less stuffy than BE, which can
 make it a more pleasant and accessible language to
 learn.

However, it is important to note that BE is still a very important
 variety of English, and it is spoken by millions of people around
 the world. If you are planning on traveling to or working in the
 United Kingdom, it is a good idea to learn some BE. Additionally,
 BE can be a valuable asset if you are interested in studying
 literature, history, or other subjects that are closely
 associated with the United Kingdom.

Ultimately, the best choice for you will depend on your individual
 needs and preferences. If you are looking for a variety of
 English that is widely spoken, informal, and accessible, then AE
 is a good choice. If you are planning on traveling to or working
 in the United Kingdom, or if you are interested in studying
 literature, history, or other subjects that are closely
 associated with the United Kingdom, then BE is a good
 choice.