Old traditional development methodologies, such as WATERFALL, follow LINEAR sequential development/ testing processes. Agile testing offers more benefits than the old traditional testing methodologies. Testing using agile methodology ensures reduction in cost and the capability of delivering products of the highest quality that are in line with end-user EXPECTATIONS. 

Below are the benefits of Agile testing: 

1. It ensures that testers are involved from the START of the project, are well aware of the requirements and know exactly what will be delivered in the next iteration. They are, therefore, able to prioritize their test cases and artifacts in accordance with work progress. 
2. Testing is performed alongside the development work, and products are tested during the build. This early detection rescues FATAL escalations. 
3. Agile testing is product-driven and requires less documentation. Continuous deployments, and regular feedback from the client ensures quality and hence saves time and money. 
4. In this type of testing methodology, the testers have more time to write test cases as they are involved from the beginning. 
5. Testing from the beginning, regular feedback, and continuous testing ensures that product build works as per the expectations of the client. 
6. In this type of testing the fatal errors/ bugs are located early within the iterations before the product is delivered to the client, and this greatly reduces the cost of defects.