I own 1 Princton Tec Swerve, 3 PBSF's, 2 Radbot 1000's, 2 PB Turbo's, and 2 Danger Zones. I also have a pair of 100 lumen DIY taillights.
You will find a comparison of the blinky's
here.
There are ride by and ride away videos in that thread as well.
My short takes:
Swerve: better than nothing. Switch reduces power to light as it ages. Poor mounting.
PBSF: OK in overcast through dusk/dawn a bit beamy aiming is critical. Switch can be temperamental. Output drops after about 16 hours or so but it isn't apparent close up.
Radbot 1000 and PB Turbo are close, slightly more output from the Turbo, but a very short duration and narrow beam. Need a bag for these in group rides to tone them down a bit. Figure 6 hours running time for both before output starts to drop. Can be seen in daylight in main part of beam far enough away to do some good, though not great. The Dangerzones screws seem to be standing up fine, the spring connectors need bending in cold weather or the lights will go out over bumps like RR tracks. The Turbo's button is not very compatible with the older PBSF backs (I affixed a hinged PBSF to the helmet). I get some self turn on/mode change if the light is not 'just so' in the older style back. Side output even at night is feeble IMHO in the Radbot. Too little seen too late side on. The Turbo is better in that regard. The Radbot is good for pedestrains on dark paths, not effective in traffic. The Turbo can be seen by cross traffic at night fairly well. A good headlight warns cross traffic sooner and better anyway.
Dangerzone: nice switch, wider but lower total output but the width may have messed up my readings. Not usefully visible in the day. Nice wider beam is useful at night. I have mixed feelings about the clip system on these. I wonder if they will stiffen or get too loose as the lights age. They can partially clip too, so you need to look to make sure they snapped home.
All but the Swerve fit the same mounts and are interchangeable.
More thorough day and night videos await the imminent arrival of LiteFLUX Red Zone 4'S from OZ. More power spread wider.
BrianMc