Checked most of the mentioned games (Except the Interstellar Rift) and stuck to Starmade.
1) Space Engineers are of course cool and intersting (just try to build a pretty ship with sophisticated conveyor system xD Also, Programmable Block) but... Well, it was a good (maybe not-so-optimised) game till Keens added planets. With planets added, Space Engineers turned into a slideshow for my PC. So no, thank you, I love eye candy, but I prefer to play a game, not watch some pretty pictures. Also, 2,5m cubes? Are you serious? Also, SOLID WATER.
2) Empyrion. Nice and pretty, with flora and fauna, but damn, I am able to build a huge starship - but I need to mine resources for it BY HAND??? WHAT THE???
3) Avorion. Nice, intersting sandbox with some lovely crew management - but forget about interiors. Bridge? Engine room? A lovely garden? A comfy cabin? Sorry, not supplied. A good X-style game with advanced ship designer, nothing more, nothing less. Worth checking, just a different approach to a space sim.
As for the Starmade graphics - maybe it isn't so realistic, but its bright side is that you don't have to rely on pre-created graphics, models, components. Create them yourself! Not satisfied with window placement? Move it! Or remove completely! Bad corridor? That's your fault, redesign it! Stupid bridge setup? Well, that was your desire to put that console right in the middle
So, time to fix it, not to rant about stupid developers. Be an artist and build yourself a perfect ship you'd love to fly. All necessary parts are included, just be creative in using them.