I usually run solid on both front and rear. In Germany it is illegal to have a flashing light on a bicycle. Granted, their infrastructure is different than ours and the use of dynamos are much more widespread, but interesting to see what European countries default to.
I'm trying to find some data on the effects of strobe vs steady. It seems to come down to the fact that strobe get attention faster than a solid light, however, it makes it harder for people to judge your distance and speed, so there is a trade off here.
Bit of info here:
https://bicycles.stackexchange.com/q...-a-steady-beam