It depends on your definition of;
"The best" and "investment".
If you said, memcoins are the best when it comes to gambling, I will not argue with you because what you described above is just like gambling. It can make you millions in glimpse and it can also varnish in seconds. So, it's better called gambling than investment.
If you are looking at the best form of investment as long as cryptocurrency is concerned, you can look the bitcoin way. It might not make you rich overnight, but you will also not wake tomorrow and discover that your capital is gone. But on the long run, bitcoin will give you good returns.