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The benefits of using LINQ's AsParallel.Select with a synchronous action compared to using Task.Run with a synchronous action are:

1. Increased parallelism: AsParallel.Select allows for parallelism of the processing of data, which means that multiple elements can be processed concurrently. Task.Run, on the other hand, only uses parallelism at the task level, meaning that individual tasks can run concurrently.

2. Higher performance: AsParallel.Select uses a partitioning algorithm that is optimized for parallel processing of data. This results in higher performance compared to Task.Run which only schedules tasks for concurrent execution.

3. Reduced overhead: The overhead of creating and managing individual tasks using Task.Run can be higher compared to AsParallel.Select, which utilizes a single partitioning algorithm.

4. Simpler code: AsParallel.Select simplifies the code by reducing the need for managing individual tasks, which can result in more concise and readable code.

5. Improved scalability: AsParallel.Select provides better scalability for larger datasets as it can dynamically adjust the number of threads used for processing based on the number of available cores. Task.Run, on the other hand, requires the number of tasks to be specified upfront.