Full version would be better really,
XP Pro has:
Advanced Networking such as password protection and encryiption for files and folders with group access policies.
Better handeling of Network conections.
More sevices for running web-servers,etc.
Added restriction and security settings for networks.
Many more features really aimed at network users, however, Home edition is far more secure. It has les danagerous services running and its good enough for most users and does have network capabilities but not to the degree that XP pro has, EG: You cannot decide who views a file nor password protect it but you can in XP Pro.