[jbergens]

I think Glimmer/Ember have lost already. React is fast enough for most things and then there is Infernfo and Preact that are faster right now. If you mean a larger ecosystem as in number of libraries I would guess that the react ecosystem is 10x the size of Embers.

[maxkwallace]

From my experience, the ecosystems are qualitatively different.

In Ember's, there's typically one community-sanctioned library that solves a particular problem, whereas React's tends to have more competing libraries. Like the frameworks, it's a tradeoff betw. customization and strong conventions. Doesn't make sense to compare based on number of libraries. Both approaches are valuable.