Truly world-class engineers can be brought to the US on O visas. H1Bs are trying to fill a need for good or even great, but not amazing, engineers. Which is why it's a tragedy that so many of the spots go to shitty outsourcing firms for mediocre wages.
Depending on the field getting an O visa can be exceptionally hard as they are intended for exceptional people. One of my clients has four or five employees with O visas and these people are all top of their field including a nobel laureate. You could easily be in the top 5% of your field and get rejected for an O.
