Q:

How to log Exceptions in Nlog2? 

I am a bit confused what way is the right way to log exceptions
 Log. Fatal(exception format, args);

or
  logger. FatalException("Got exception.",  ex);

A:

Seems like mostly a matter of preference.  I tend to use the log. FatalException("blah", ex) model for two reasons. 

That's clearly what it's there for. 
You have a bit of control over the format of how the exception is displayed in the nlog configuration.  See: https://github.com/nlog/nlog/wiki/How-to-log-exceptions

