Self-driving first for sure, since cold fusion isn't thought to even be theoretically possible, and I think self-driving is likely to arrive sometime before "never," even if it's a long time from now. With the uptick in funding for vanilla/hot fusion, though, self-driving vs. hot fusion (Q>1) is actually a legitimately interesting question, I think. I'd probably still bet on self-driving, I guess? But I'd be less confident (and I don't think either is soon).