The PBSF sets the standard for bright, affordable, and long lasting... the run time is amazing because of the .5 watt LED while the radbot is a little brighter but has a diminished run time.

Your rear light should be brighter if you have to ride in denser traffic as lesser lights will get washed out... if you want to be more visible mount a rear light to your helmet as it brings the light higher and makes it more visible.