And just to answer the thread title...
The one with the MOST plugins WINS!!
Seriously....you can do just about anything you want with the plugins that came with
Sonar X1 Producer...
The main reason for the other plugins is to capture a "sound quality" that is
given by that particular Type, be it compressor, reverb, etc...
Hence the myriad of plugins available...
I highly recommend learning the ones with Sonar. Then when you feel you need something more...
Then start checking out the others...
They all do basically the same things....just different "sound" Plugins are "sampled" or more appropriately, "modeled" hardware for the most part.
I recommend the Sonar X1 Videos. They will give you a good "foot in the door" of Sonar.
Oh yeah...usually the issue you describe is a "level" issue, where the backing track is playing to low and/or
the guitar is playing to loud. That's what MIXING is all about...getting the sound and the levels in a good
place so that everything sounds level and well balanced.
Cheers!!