I don't know any altcoins that are better than Bitcoin. The question is, better in what? Are they more decentralized? I don't think so. Are they more reliable in the long run, or more secure due to a strong community and high market capitalization? Not really. Are transactions cheaper and faster? Perhaps they are, so that could be an argument.
Bitcoin is strong, the market cap is huge, it's a PoW currency, and it's been #1 since it appeared. That's why I choose Bitcoin over any other altcoin.
It depends on what matter we view. If we want a more stable price, there are stable coins that are better than Bitcoin. Altcoins prices are mostly more volatile than Bitcoin price. So altcoins is a better choice for trading because the prices can change faster. And don't forget that there are altcoins with cheaper transfer fees. But if we want a more recommended coin and trusted coin, Bitcoin is still the best option. No coin is better than Bitcoin if we want to invest in a coin for a long term investment. Well, Bitcoin is number 1 coin but sometimes altcoins can be better for some matters.