I’ve been deeply studying all these for over 4 years - spent the most amount of time researching bitcoin and cardano. XRP and SOL are very centralized compared to bitcoin. Cardano, however, is extremely decentralized as well. A world with bitcoin and cardano will be more decentralized and resilient than a world with just bitcoin. That being said, I believe bitcoin is the greatest hard assent ever discovered and will continue to reprice everything in the long run. Cardano will still have its uses in bringing power back into the hands of the people.