Just to confuse the issue, I use both! Each method has its strengths, but at the end of the day I think it's down to personal preference.
I believe that you should manage without OEM to start with, then after a while start using it & see if it helps. The problem with using OEM is that you can hide the SQL statements so you don't really see or fully understand what it is you're doing.
90% of users' problems can be resolved by punching them - the other 10% by switching off their PCs.