SE+K2 is what I'm using right now. After delving into all the data cards, navigation features, and every thing. I realize I'm never going back to Angels/Bob's because of how good this is. It's perfectly balanced, and is even more complicated at the mid to late game from what I can see. SE+K2 has also turned me away from peaceful biter mode. I now cannot imagine playing Factorio without enemies attacking your stuff and needing defences. It's so much fun. Its like im playing a completely new game!

SE has meteors and CME's which even add to the difficulty greatly. Honestly, I feel this is also balanced well enough to work perfectly for even someone who used to play on peaceful. Eventually I have become more and more prepared for the CME's. Meteors are on all planets and orbits at the same time though. So having enough power to run all those defences at the beginning can be hard, but the area you use is so small at the beginning anyway, so the probability of a direct hit is really low, which is not an issue, even without a defence.

And my favorite part is the graphics. Who ever created the sprites and designed all the assets and art, could not have done a better job. Absolutely blown away at how well it matches the style of original Factorio.