I play with a fair amount of different Atomics. I find the one that comes from the dead phoenix set has the most burst resistance, as I have owned three total from this set and every one of them has felt as if they had tight springs. Oddly, these Atomic pieces also seem to work extremely well in opposite spin. They never let me down when I use them for spin stealing beys. The Atomic that comes with Walborg feels good as well. I use it on Archer Hercules currently and it works well fighting opposite spin match-ups. The Atomic that comes with the new Stardust Pegasis feels the most free spinning, yet it without a doubt had the least amount of burst resistance. I haven't played with that one a lot especially compared to the others, but on Judgment it seems to do quite well. Maybe it's just smoother because it seems as if it self KO's less than the others. It would be the Atomic I throw on an attack layer.
I'm not a miracle, I'm a heaven-sent instrument.