Want me to google that for you?
There are plenty of reports supporting all the arguments
OLS is faster than Nginx
OLS is faster than Apache
Apache when optimised properly is faster than both
As for bugs. Show me a panel. Show me one panel that does not have bugs.
Take cPanel and their latest release for example and its advisory about disabling updates due to servers crashing....
Im sure the dev here will also say that aapanel is far from perfect.