If you asked me this question back in '09/'10, I may have said Jams every now and then. But ultimately it comes back to my #1 favorite shoe of all-time: CONCORDS aka the reason my sneaker addiction got fired up (got into Js seriously in 2006, waited patiently every year til the 2011 retro).
I even passed on the Cool Greys just so I could double up on Concords
I'd say Space Jams. I think they're a more subtle colorway which makes them easier to pair with outfits. The contrast on the concord is dope but I guess it's a matter of personal preference.