Hello Rubina !!

If only scope is considered then MBBS has a upper edge over BAMS and other medical degrees , at least in India. The average earning of  MBBS is way higher than that of a BAMS degree holder .

But there are doctors who after doing BAMS has got recognition due to their work . Though the number is less if compared to MBBS Dr.If studied and applied properly then even as an Ayurvedic Doctor you can easily flourish . Nowadays people have started going to all sort of doctors for medications , be it allopathic, homeopathic or ayurvedic. 

The research fields are slowly widening in these areas. In abroad also ayurvedic doctors are finding a good reputation .

Some ayurvedic doctors after completing UG degree opt for studying allopathy medicines, which not be much helpful . Ayurveda needs that you believe in it and practice it .

If you have a will to become Ayurvedic Doctor then go for BAMS else take a drop . Because lack of interest later will be a pain for you .

All the best.

Hope this helps .