What it comes down to, is what YOU like. I would suggest you download Visual Pinball, (free), every game mentioned here, and more, (free). Sure, playing the real machine is different, but you get to try out the rules and visualize the table. The ROM's are exactly the same in the real pins as they are in the virtual pins.
Turns out I liked Scared Stiff by far the best out of all I had downloaded, and that's the lone pin own (currently)