Pwrsonally I don't see any other coins that are worth daily trading besides Bitcoin. Also, day trading is very demanding, it requests a lot of experiences and knowledge and your full attention to the market so it would be very hard to follow this for multiple coins. But maybe there are some successful traders who could manage that also.
I think the same, I like to trade with bitcoin and ETH because for me both of them are really good coins to trade for day, as price rises faster in day trading, it has more potential and it is first crypto currency, we will see progress even more with passage of time, trading is the beneficial only with bitcoin not any other coin.