Exactly, popular coins are always the best choice for the long term because, within a short period, it is impossible to reach such a higher in a limited period of time because right now the market situation is unpredictable and makes most of the potential altcoins are decreasing their value whenever the price of Bitcoin drops.
Yes, popular coins will have the chance to increase higher in the future but to be 100X from the price now, it still needs help from bitcoin price because if bitcoin price does not rise so high, that coins will not have a chance to grow. Sometimes, the low coin price can increase 100X if bitcoin price increases 10%-20%, but it is hard to know which coin that can have the power to grow. But that will happen in the next bull run if it is happening in this year or next year.