Despite I think that the new law is a huge step forward for Spain, the visas are nothing if there are not an infrastructure behind it. SV has a huge investors network that Spain just doesn't have.
I think maybe it could be an option in several years... right now, as Spanish, I think it's not the best place to launch your start-up by far. We could consider the political atmosphere too, next year is gonna be the president election and the country could be unable to be managed...