One thing to bear in mind when looking for the brightest...
Some lights are very bright when looking at them head on, but the brightness drops away as the angle increase.
What I like about the Flare is that is remains very visable, even from the side and beyond.
I usually have it set to pulse during the day to attact attention, or steady at night in urban areas as I would think the pulse would be too annoying and distracting in close proximity in traffic. If I go for a night ride in the country I have it set to pulse so that it will get attention from faster moving traffic further away..