There is more Stellar on the stock market and Yes, most likely the developers there are good, but Cardano more capitalization than Stellar and she's in the top 10. Therefore, there is a controversial issue. I prefer Cardano myself.
i still think Cardano can be better than Stellar because Cardano was born to become better than any other coins like BTC or ETH, it is more advanced than Stella and specially can be used modern financial world, rightnow Cardano can be weak and loose Stella, but i think it will be soon complete and defeat Stella.