That's not a very useful label then. They're just better executing companies in the sectors they're in, and sometimes it's older companies too as they innovate.
But personally, I think "higher risk" is a better descriptor of 'tech' than "Better executing" - by my definition, a tech company is applying new processes to their business that would not have been possible with older technology. That's a risky thing to do, and it can go badly and go well; It's easy to overestimate how useful a new technology is, or how much difficulty your traditional competitors will have competing with you.