I live in the UK, so speak with a British accent, but there are often more American resources. Most movies and famous TV shows are american, so if you enjoy watching those and think you'll use them, you'll pick up an american accent easier, but if you watch a lot of British films/TV, British will probably be easier. You'll also find it easier if you're using american lesson books and learning resources to learn an american accent and spelling, but if your using British resources, then you'll probably find it easier to use a British accent and spelling. You'll also be influenced by your friends and teachers' accents when speaking English with them. Hope this helps.

In my point of view, British English is easier compared to American one.The British English is almost standard English, however, the American one is a bit far from the standard English because they use a lot of "phrasal verbs" and "slangs" that makes their conversations so difficult to understand. In addition, they don't articulate strongly the phonems which makes the understand of American English even more difficult.

Both are difficult. but for me, american are easier to understand and i find they sounds more familiar cause at the school in my country, we learn american english