Hmm....Back in 2012,13,14 when i was interested & passionate about BO numbers i used to collect Area wise Distributors officials from their twitter & other source & compile it by myself.
Now i dont have that passion nor patience so i would recommend Andhraboxoffice.com for south films overall.
Also TamilBoxoffice1.com for tamil films only.
Our Co forum member Charlie Jatinder also has a website Cinetrak.in ,he is taking numbers from that 1st hand distributor sources and compiling himself.
But he took non convetional approach like deducing the hires numbers from day 1 figs & other things.
Haven't seen his site recently dont know whether he is up dating it or not, ..take a look at his website also.
So as of now take ABO as BOI of south.