Tube sites have a ton of free videos, but most of them are of crappy quality.
And with the amount of awesome girls are out there and how good the cams and the technology is these days, I really don't see myself ever going back.
Cam sites have tens of thousands of performers, like Rabbits Cams for instance, with dozens of new ones appearing every day offering much appreciated variety and freshness.
Although, many guys fall for one particular model and that may leave them wanting more when she disappears. I often find myself really enjoying a certain angle and/or position in a porn movie only to have the camera angle change and the performers switch positions.
And if we bring the metaphor back to live cam sites, when you have the model all to yourself you get to direct the show.
Tell her what you want to see and how you want to see it and most of the time your wish will be her command - just be polite, don't be a jerk and maybe ask her in the free chat what she does and doesn't do in private so you know before you head in there.