Answer:
The IPv6 simplified header is better than IPv4 because the header is smaller.
The size of the IPv6 header is always 40 bytes, which is twice as large as the IPv4 header. But IPv6 gets rid of a few fields in the IPv4 header that are rarely used or have stopped being used over time. For example, IPv6 gets rid of the Header Checksum field because the transport layer protocols (like TCP and UDP) already have their own checksums. This makes the IPv6 header simpler and smaller.
This reduction in header size is good because it improves network efficiency by cutting down on the overhead caused by the header. This means that network resources can be used more efficiently. Also, smaller headers make it easier for routers and other network devices to process packets quickly. This makes it easier to handle packets and improves the performance of the network as a whole.