Dedicated datacenter proxies are both cheaper and faster. However, they are easy to spot. Amazon will quickly notice such proxies and blocked them or feed you false data. Another big drawback is that datacenter IPs come in groups called subnets. If one proxy gets banned, it can take up to 264 IPs with it.
For these reasons, you should choose residential proxies for Amazon scraping. These are IPs used by real internet users, so they’re much harder for Amazon to block. Residential proxies often use backconnect servers which are easy to set up and rotate. This lets you make hundreds of connection requests without getting banned.