Worldbuilding which treats a thousand years as the depths of an unknowable timespan, even though on Earth we know exactly what kind of stuff was going on circa AD 1023, -VERSUS- worldbuilding which treats ten thousand years as a reasonable "very long time", even though on Earth it's 1. nearly twice as old as recorded history and 2. an entire one-tenth of the time Homo sapiens sapiens has existed
of course, my next thought is "why would you pit two bad (as in poorly-written) bitches against each other"