The advantage to the bounce is the release of system resources...
however, if you then delete the source track to save those resources
then you've cut off your "retreat" point...that is to say, if you decide
you want to go back and try it differently or fix something, you've
cut off your means to do so...
I personally save my projects with different (numbered) names so
that if I want to go backwards I can...and not lose a lot of work...
Also X2 allows "versions" which many use...
That choice is up to you...but I HIGHLY recommend leaving an "escape" route..