Favorite System for Scifi Campaigns

Hit me! I am in the process of fleshing out a campaign, but I am not sure yet on the system so I am open to suggestions.

What kind of sci-fi?  I'd give different answers depending on hard sci-fi or space opera or a mercantile game.  What's the campaign about?

For me it's Hero System...mind you, it's my favorite system for pretty much everything.... <a href="https://www.herogames.com/browse.htm" rel="nofollow">https://www.herogames.com/browse.htm</a>

Given that you have a campaign in mind, it may not work out, but I've had loads of fun using Sufficiently Advanced. &nbsp;As others have mentioned, if you can share more info on the type of game you're hoping to run, more directed suggestions can be made.

I'm with Dave D on this. &nbsp;Are we talking cyberpunk future, space opera, apocalyptic...?

If you're looking at something you're building freeform and are looking at a serious and detailed (VERY detailed) system, GURPs works for that... but if your looking for something a bit more light-hearted and less hair-trigger on the rules (which is my preference) I'd suggest looking into d20 modern, future expansion. Or Big Eyes, Small Mouth (BESM) Otherwise I think Dark Heresy is a pretty wicked Sci-Fi system, but that's also a campaign setting as well.

Star Siege, by TLG. Also functions as a generic ruleset, and completely compatible w/their other games. (Castles and Crusades, and the pulp one that i'm not recalling at the moment.) Also a dead game. You can still get it, but 'Keeping up w/the Gygaxes' isn't an issue. Make your own feats/effects, simple resolution.&nbsp;