Cardano is the only cryptocurrency which is developed according to scientific philosophy and with the help of different leading developer and engineers from the globe so its technically better than any other cryptocurrency in context of stability.
It works in the algorithm of proofs of Stake algorithm that is believed to be one of the most secured protocols called Ouroboros which is almost tamper proof.
So everything that makes this cryptocurrency in top list is its features by which it is developed. So its better to invest than other cryptocurrencies.