To be fair, US model produces both. The same regulatory and cultural burden that makes EU an infertile ground for money-burning billion-dollar scams also makes it harder for decent companies to create useful innovations[0] in general.
I feel we could use a little more easy capital in double-digit million € range, but retain or even improve the friction above low triple-digit million €. Basically: experimentation is good. Unchecked growth from zero to multinational behemoth is not always so good.
There are two hard problems though:
1. At the lower end, it's very hard to distinguish a legit experimentation from a scam. We already have too many fly-by-night small businesses preying on the population. I'm not sure how to fuel more legit startups without making the latter problem worse - as we can tell from the EU grants, adding more strings tends to kill good businesses faster than bad ones.
2. At the upper end, big corporations are geopolitical weapons. Nations and blocs like EU are always in conflict with others; currently, it's mostly economical warfare. This means that any country or bloc tends to be happy if they can spawn a billion-dollar company.
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[0] - Where by "useful innovation" I mean one that's ultimately yielding a net positive value for the society, and is not purely a business model innovation like it's common with so many hot tech companies these days.