Slow in, fast out has always been the go for me. I'm talking bitumen, not dirt.
I know that if I have the braking mostly done before tipping in, I can adjust the throttle through the corner and accelerate harder when I can see the exit.
If its a tightening radius corner then 99 times out of 100 looking where you want to go will get you there. The bike is more capable than you are (mostly!).
If I need to brake during the corner I will, but remember that braking will make the bike stand up, when you actually want the opposite!