This is a no-brainer fact right here! If you're going to pick a bike at a store, make sure it fits you the best possible way, according to your body measures and needs. It is strongly recommended to analyze a lot of bikes and try them out before finally purchasing one.
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If there's a local BMX store nearby, you can just head there and try to see which one feels more naturally and comfortable in terms of your actual conditions. If you're a beginner, then this is way more important than you might think. Of course, you should choose one that satisfies your needs but also one that is affordable. Avoid going too steep on the price if you are still not an experienced rider. But most importantly, listen to suggestions from those who have plenty of experience on BMX bikes, but ultimately choose the one that feels perfectly comfortable and makes you confident enough.