Most people usually go for Bitcoin when it comes to day trading and I believe that Bitcoin is the best coin for day trading because the liquidity is higher and you can make a lot of profit while trading it unlike you will do when trading altcoins. Though there are altcoins that are doing well, just like we have ethereum and there are also traders who likes to trade ethereum as well. I think it has to do with what you like and what you believe would be working for you. I have not trade XRP before, but I don't really know much about it. But cardano is good, you made a good choice I guess.