Fortunately, British and American Englishes are not too far from one another in terms of vocabulary or pronunciation. There is no risk of serious misunderstandings. It might be better to pick American if your goal is to become proficient at English. That's because some parts of colloquial British vocabulary tend to be not well-known to most people who speak English as a second language or even North Americans whereas the British usually have enough exposure to American English to know the American counterparts of those words.
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Exactly. And even within the different registers of American English, there are regional variations that can challenge any other speaker's understanding, even native speakers of english, let alone L2 learners. But the beauty of linguistic interaction is that exposure and openmindedness can easily help overcome these communication hurdles.