As a Timeline writer about Buddhism, I would say that a Buddhist India would actually be better, in the long term. Here's why.
Buddhism is more open, flexible and outgoing. Hinduism deals with problems like "History Centrism", Ethno-centrism and Hinduism is a very complex belief system with rigid and flexible parts. This results in multiple problems. With all these problems, they are easy to be divided, when a political change takes place, due to an outside invasion or influence. This actually led to the permanent fracture of Indian kingdoms, which eventually led to the Islamic conquests.
In a Buddhist majority India, I would see a more united land and a less ethnic strife. The Northwestern and Central Asian regions wouldn't undergo the OTL like rampage (first by the various Pagan Huns, etc and then Muslim invaders) and be very much within the Buddhist sphere of the Indian subcontinent. This leads to a Political and Economic stability in the South Asia, which would actually make it better.
In the Modern World, however, we would see less ethnic strife inside the subcontinent and a nation that isn't easy to colonize and exploit, as it happened in OTL. There would be more of a "Buddhist sphere" spread across South, Southeast and East Asia, which predominantly share an ethos and a more affinity to research into things. This would change the mindset of the whole pouplace in these regions.
You can check out my Timeline (in progress) about Buddhism, if you're all interested.