Lightning Cable Charging Speed

all the cables charge at the same speed, the watt of the ac charger and if both charger support fast charging set the pace

not really, mostly a cable is just a connector with small metal pins that are connected to thin copper wires encased in plastic to another connector with small metal pins connected to the copper wires. only problem a poor wire could bring to the table is if high level of current was drawn it would cause heat and melt and catch fire, but ios devices don't drag that much current, and such cables would be illegal to sell in most countries.