Interesting move from Covesting, been watching them for a while and have used Prime a little too so look forward to using their copy-trading functionality on Prime.

It has already surpassed both Dash and Zcash in value market cap wise, the value per coin is much more tied to supply, not development. So Monero can be better, have a bigger market cap and still not necessarily surpass the value of Dash/Zcash. I think all three coins have some good privacy features but out of them, Monero is slightly ahead of the curve. The developers behind Monero are some of the best in the business too. But again, that doesn't mean to say it should be worth more than the other 2.

How are you quantifying "better"?

They are different coins with very different purposes - both can be (and are) good at what they do to a certain extent. Is XRP a better currency that ETH within the Ethereum ecosystem for executing smart contracts? Is ETH a better means of sourcing and moving liquidity on demand within the banking sector?