Good body work will have you use the least amount of filler possible. All dents should be pulled as best as physically possible, with filler used to smooth out any imperfections. Pulling the dents out may take an extremely long time compared to slapping some Bondo and calling it a day, but you'll have pride knowing it was done right, and that the work you you put in will last a long time. Too much Bondo can result in cracking, peeling, and flaking of said areas over a period of time.