[Hermel]

The Z3 was the first operational turing-complete computer (May 1941, a few years before ENIAC). Babbage's analytical engine was never actually built.

[CmonDev]

For me, as a software developer, it's about detailed design rather than implementation. 1837-s design is much more impressive than 1941-s implementation (100+ years later - you'd better build something with all that time).