Bottom line, dynamo systems cost more than battery systems, and put out less light, but are more reliable and convenient than keeping track of battery charging. So it all depends on how much you value raw output, and how onerous you find recharging.

Some day dynamo tech will probably get to a point where output is not an issue; then it just becomes a question of the value of liberating yourself from batteries, which will still be a personal judgment. So the lighting wars will continue, ad infinitum.