I had Silverstars before, as well. To me, they seemed to be the least based on marketing hype. I will say that they're whiter, and they make me squint a little more when I look at them, but I think testing for actual light output will show it's not as bright (most aftermarket bulbs use a film on the bulb to change the color, so it will always be <100% output). You've gotta move up above the 55w to get more light, then you hear horror stories about people melting their sockets...

Just the hearsay I've heard.