I have StarDrive, but havent played it that much, since i prefer Rebellion. It does not mean its bad, though, actually there are certain aspects, which are pretty cool, and i wish they were transferable to game like Sins...
Aside StarDrive the only 4X space games i ever played are Ascendancy and Pax Imperia 2, so its kinda hard to compare for me. I think both of those games were basically real-time, while you could make time run faster/slower or pause it completely, and StarDrive is the same way, so there is no "turn" button. Even though the game says various things take X turns to complete.
One thing i liked about the game, even though this was kinda difficult to comprehend at first, is the how resource system works in this game. I mean, certain planets are good for food production, other for production, you gotta import/export these goods and people between planets to supplement them with stuff they need....this was completely new to me - and once i kinda understood, how it works, and got it going, it felt really good.
Oh, and there is one stand-out thing i guess, the ship-designer. Again cant compare to other games, but here its really well done i guess, gives the game that sand-boxey feeling, where you can speculate and play-around with various designs...obviously there are some rules to adhere to, so you need actually think, what are you doing, for example all the fancy weapons and shields need to be powered by strong enough power generators, you actually to connect them via power conduits, etc... if you like this kind of stuff, its definitely a game for you.
The negatives for me its the pure single-player nature of the game, i like to play my games with my friends. Additionally one thing i particularly dont like are the races. Not only they look like various animals (owls, samurai bears, wulfen, etc), which kinda makes it bit less serious, and i dont like that, but most importantly, they are all the same basically. You make them unique by choosing few special trait at the beginning of the game, like "industrious". "meticulous". "astronomers" or "polluted homeworld". otherwise their research trees are pretty much the same. And thats never good enough for me when compared with pre-designed races like those in Sins. I way, way prefer the Sins approach.
Anyway, I guess it depends on your preference. The StarDrive is probably less complex and more stream-lined game than DW, at least it definitely looks so when seeing the DW videos on youtube. Personally i need certain things to be schematised, abstracised. Dont want to deal with every single detail nor do i like to put too many things on auto, cause it feels like it is playing itself then. Thats why i chose SD over DW.