as a biker, i don't want to make friends by 'accident', so being annoying with the flashing lights lets me know i was seen and not 'hurt'.
that said, i also find flashing lights are not effective for my own navigation in very dark areas, so i will turn it on solid but normally i have two lights - and i will use my BP2WBlaze as the blinker.
for the rear i also have two lights - BP and the Radbot. I keep the BP flashing and i have started leaving the Radbot on solid. Not sure of any difference it makes though whether to leave on or blinking, i just like that combination.