I doubt any of the competitors have anything even remotely approaching the worldgen complexity of DF, even if some aspects of the gameplay simulation might be c

I doubt any of the competitors have anything even remotely approaching the worldgen complexity of DF, even if some aspects of the gameplay simulation might be comparable to DF’s equivalents. And the Myth&Magic arc (that should begin in earnest once the Steam version is stable) will vastly increase the depth of the world’s history and permit many, many more aspects of the world and its inhabitants to be "evolved" (with lots of tweakable parameters) for each generated world separately rather than hardcoded or just naively randomized. Another thing that is expected to vastly improve over the next several years is how "alive" the worlds are – how much things continue ticking outside your fortress during gameplay, and how your fortress affects and is affected by the events, politics, and subterfuge in the world at large.