Originally Posted by
noglider
I don't need all my bikes to be equipped the same. The three bikes that I use the most are also the bikes I am most likely to need lights on, so they have dynamo lights. One of them has an annoying sidewall dynamo, so it's really just an emergency system. I have battery powered lights for the bikes I prefer to keep lightweight. I move the lights between those bikes as needed. This approach lets me balance performance (which I perceive to be superior with dynamo lighting) and cost.
That's more in line with what I do, it doesn't have to be one or the other. My primary bikes have full dyno lighting, my vintage and play bikes have period or minimal lighting. I use a usb cygolite or cateye for their flash mode and as a backup.
One of the real benefits of a dyno system is when I forgot to charge my light or phone, I can just plug them in to charge while riding. Its also preferabl to carrying chargers and/or extra batteries for long, or multiple days.