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Stay away from Silverstar. They are tinted bulbs. They are not any brighter than Xtravision, just whiter and actually a bit less bright. They also do not last very long at all.
I like GE Nighthawk and Silvania Xtravision. Don't get Nighthawk sport series though. They are tinted as well.
The Xtravision is available at most stores. The Nighthawk is harder to find, but Amazon has them.
There is no advantage to it. Its just trendy crap to simulate HID. There is nothing good about it. A true clear glass bulb is the only way to go. Any of the +30 or so bulbs that are clear would be what I would go with.