nope shes been nerfed just this patch so now her base atk spd and her atk spd growth is shit and twitch is actually wayyy better anyway cuz he crits hard, lifesteals all that shit, then fucks up the back line with his ult, and can clean up with his q stealth
roaming as twitch is more rewarding and his e range is slightly longer than that of kalista's rend so actually twitch is waaay better, he is just not meta and is a solo carry adc not rlly in need of a support except to keep him alive
kalista plays around her support being tanky and having lots of cc so she can stack her rend spears to one shot the enemy lol i still like twitch wayy better and he does just so much more mid to late game
also kalista and twitch have pretty even lane phases except for the fact the twitch is the only adc with a good escape and kalista is one of the more easily ganked adc's i know.