This thread, as is the case with a couple of others at the moment, demonstrates just how subjective the answer to even an apparently objective question can become. There's a chart on the site somewhere with the frequency response of a large range of strings. But bassists don't play strings, we play a system; basses that have their mechanical and acoustic characteristics, circuits and preamps and power stages into speakers and into rooms, and then into people's brains via their ears. If you need an answer re the strings, check out the chart (I'll try to find it), but as per the above, once in the system above, those characteristics might be a largely insignificant factor in the tone you and others actually hear.