As someone outside the US who has worked with several of those companies before. The best one for the employees was Globalization Partners. Of course they were

As someone outside the US who has worked with several of those companies before. The best one for the employees was Globalization Partners. Of course they were the most expensive. Deel is the opposite: they provide US companies with gray area (or you could even say illegal in some countries) trickstery to reduce cost of employing people.