I think that all replacement bulbs are limited to a maximum "brightness", but the brighter appearing bulbs have a higher color temperature (whiter, less yellowish.) On the Sylvania Silver Star "Ultra" the light color is whiter, but the bulb life is about 1/2 that of the regular Silver Star light.
I don't know about the Xenon Charged bulbs, or the LED replacement bulbs.
I haven't used the LED headlights. They use less power to make the same brightness, and sounds like they have a real high color temperature.
On other LED lights I have used I noticed when they are brand new they will be very bright, but over time they stabilize with a bit less brightness than when new.