The "war of the currents" was won by AC because at the time AC voltage conversion (transformer) was much simpler and more effcient than DC voltage conversion (motor-generator set). Efficient voltage conversion is nessacery for large scale electrification to work because without it either end use voltages are too dangerous or resitive lesses are crippling.
However taking a more modern look things are not so clear cut, certainly both DC and AC transmission and distribution systems are now feasible. Each has pros and cons.
Pros for DC
1: pretty much all current flow represents real transfers of power from source to load, unlike in AC systems where reactive and hardmonic currents inevitablly flow due to the characteristics of loads and the inductance and capacitance of cables
2: there is no need to synchronise generators before paralelling them
3: the peak voltage is equal to the rms voltage. Since insulation requirements are generally determined by peak voltage a DC system can operate at a higher RMS voltage for a given insulation thickness/insulator size.
Pros for AC:
1: large installed base of equipment which brings economies of scale and compatibility
2: much less prone to sustaining arcs which makes switches and circuit breakers much cheaper and unplugging stuff without turning off first much safer.
3: while voltage conversion of DC is now possible with reasonablly high efficiency the converters require complex power electronics. I'm sure a DC equivilent of a "pole pig" is feasible but I would expect it to be considerablly more expensive and probablly less reliable.