Search for posts by gtguy. He has seen the UK300s (H7 bulb) and the non-HID STi projectors (H1 bulb) side by side. If memory serves he found the UK300s to be brighter.
I have the STi projectors and have been pleased with the light output, so long as they aren't covered in nasty winter road grime.
I'm also going to be putting in a pair of Philips VisionPlus bulbs on the recommendation of others to see if I like them.