All the altcoins are considered as the best coins for the sake of day trading and short term investment of money and that is the reason most of the traders trust them as compared to that of bitcoin for day trading.
I agree with you. For me bitcoins are good for long term investments while altcoins for me are good in day to day trading, like for example if the market is red you can buy altcoins that have a potential to rise and sell it when it when the value is higher compare to the value when you bought it. I mean alts also is not that expensige when you buy it and sell it while bitcoins value is to expensive for day to day trading.