IllustratedMenagerie

I don't think any are better. Definitely merit to all three. 66 million years is plenty of time for any of them to develop sapience under the right evolutionary pressures. I think oviraptorids and troodontids might have a slightly easier time as they already have omnivorous members and that can be helpful in the kind of flexibility one expects during the development of sapience but even then dromies could easily take those steps too. Because I haven't ever seen someone explore sophont oviraptorids that gets my vote, but that's not actually 'better' if that makes sense. Just would help make your take on the concept a bit more fresh. While some troodontids may have been more intelligent than the other two clades, they were all, quite frankly, not very intelligent compared to many modern birds. That is said with the caveat that birds in the mesozoic weren't that intelligent either, certainly not compared to modern crows and parrots.

It has been suggested that dinosaurs going extinct, or at least the major clean slate and following adaptive radiations, were inciting incidents in the development of higher intelligence in birds and mammals. It's not a field I'm much learned in, but just might be worth considering adding at least some major turnover or perhaps just in the insular region in which these intelligent dinosaurs are evolving, perhaps? High intelligence in birds and mammals, much less dinosauroids, may not be an inevitability or even particularly possible if you keep your alt prehistory too status quo. The extinction and sudden opening of new doors, niches, and possibilities could well have been major factors in what we see today. Just something to consider.