It seems everyone who commented on your topic has only one answer and that is Bitcoin. For me, I will choose also the same answers. Bitcoin might be expensive for now compared to other cryptocurrencies but the certainty of giving a profit is higher. Yeah, there can be altcoins that could surpass the rewards can Bitcoin provides in a short amount of time but Bitcoin could secure your future. Besides, even if you bought Bitcoin at a high price you will still not lose because it keeps growing over time as adoption across the world increases.