Which is the best forgein country for MBBS?

USA is far better than other countries. It has an affordable package which is starting with 35 Lacs including complete tuition fees, hostel, and food. You can get MCI exemption also. Most important specialty in the USA is free and you will be getting a minimum stipend of $40000 per year.

In terms of affordability, it's Philippines and if you want a quality education, you must choose UK or US.