Many use both - the bike does need to have a fixed front and rear constant beam after dark though (and rear reflector - and believe it or not pedal reflectors!).
Personally I'm on the as much light as I can get so on the rear we have 3 lights. 1 on seat post constant, 1 on seat stay constant, 1 on seat post flashing.
I have a Hope V2 on the front and a Cateye 5 LED thing on the rear. Both lights are not used in flashing mode, though I am tempted to get another of the rear lights then I can have one on flash.
Posts
;-)
Need more info on what your usage is. Also take a look at the CTC site for laws on lights.
VOODOO CANZO
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A flashing light in conjuction can add to safety.
VOODOO CANZO
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VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
http://www.dft.gov.uk/pgr/roads/vehicles/vssafety/guidanceaboutlightsonpedalbi4556
Personally I'm on the as much light as I can get so on the rear we have 3 lights. 1 on seat post constant, 1 on seat stay constant, 1 on seat post flashing.
2 on front 1 flashing and 1 Exposure Enduro
+ 1 high viz jacket
Now watch the car driver say he didn't see me
Do skimp on the reflectors mind.