There are several countries that are considered the best IT outsourcing destinations to hire remote developers. Some of the popular destinations include:

1. India: India has a huge pool of highly skilled and affordable IT professionals. The country has a thriving IT industry and is known for its technical expertise in various domains.

2. Ukraine: Ukraine is one of the largest IT outsourcing destinations in Europe. The country has a large number of skilled developers and a thriving startup scene.

3. Philippines: The Philippines is known for its highly educated workforce and low cost of living. The country has a growing IT outsourcing industry and is a popular destination for businesses looking to hire remote developers.

4. Eastern Europe: Countries like Poland, Romania, and Bulgaria are also popular IT outsourcing destinations. These countries offer a large pool of talented developers and a favorable business environment.

5. Latin America: Countries like Brazil, Mexico, and Argentina are fast becoming popular IT outsourcing destinations. These countries offer a large pool of skilled developers and a favorable business environment.

Ultimately, the best IT outsourcing destination to hire remote developers depends on your specific needs, budget, and the type of project you are working on.