Which instance type should a solutions architect recommend for the migration?

Explanations:

Storage optimized instances with instance store provide high I/O throughput and low latency, making them ideal for databases that require fast access to data. The instance store offers temporary storage that can achieve higher IOPS compared to EBS volumes, which is crucial for NoSQL databases that handle high transaction volumes.

Burstable general-purpose instances are not designed for sustained high I/O throughput. They provide baseline performance with the ability to burst, but they may not consistently meet the I/O throughput needs of a NoSQL database, especially under heavy load.

Memory optimized instances focus on high memory capacity and performance, but while EBS optimization can improve EBS performance, they do not provide the necessary I/O throughput that storage optimized instances offer for high-demand database workloads.

Compute optimized instances are designed for high compute performance but do not provide the best I/O throughput for storage operations compared to storage optimized instances. Although they support EBS optimization, they are not tailored for I/O-intensive workloads like NoSQL databases.