DSP is excellent. I beat it before Factorio, and liked it a lot more, but I then went back to Factorio to scratch the same itch and after beating it think it's a bit better. The modding support and multiplayer, especially,

DSP is prettier, grander in scale, and also has a lot of niceties that come with being part of the second generation of the genre. Absolutely worth playing if you enjoy Factorio.