I have Geissele's in all my AR's, even the rack grade shit has the Brownells/Geissele rapid fires. I have SSP's, SSA's, SSA-E's, Hi-Speed's, 3G's, 3GSD's and an SSA-E with a flat bow. They all have different attributes but the Hi Speed is best due to the adjustments.
The difference between the SSP and 3G is that the SSP releases free and the 3G gets a bump from the disconnector when it releases. That's pretty much it according to Geissele but it makes a big difference in how they work. Both are rapid fire triggers but the SSP is more capable of taking an aimed shot without being prone to doubling or bump firing than is the 3G or 3GSD if you have a light trigger finger, loose grip or loose shoulder.
A little pre-travel isn't exactly creep. You have slop before the trigger is tight? That's not right and something is wrong then. You want some pretravel in a trigger like this where it's still engaging the hammer and moving before release. You can feel it. What you don't want is a lot of overtravel, so after you fire it should have a rapid reset. That's what it's made for. If you had no pretravel, the trigger would be pretty damn dangerous using this design in an AR IMO. But I've never seen one with slop though I have seen 'em work slightly different in different lowers sometimes.
I've tried most all but the some of the newest brands of triggers and I still like Geissele the best so far. Wilson makes an expensive single stage trigger that I thought was okay, it was a bit, uh, just not all that smooth really. Not for the price. But it was fairly sharp. I'd try it first to see if it's for you. It's a true one stage design, not a modified 2 stage setup like Geissele uses. It was the only other 1 stage that got my attention. Those Hiperfire triggers are pretty nice, I tried one but that's it. I thought it had a funny feel to it though.