Vyper VPN is one of the older VPN providers and was launched in 1994, under the Golden Frog Company, since then it has built a strong reputation and customer base. It owns a large amount of servers worldwide, with more than 200,000 IP addresses and is known for its reliable customer service.
Hide My Ass is a VPN (Virtual Private Network) that allows a computer to send and receive data from the internet via proxy servers. Therefore, it appears to the sites being visited that the servers are accessing them, rather than the computer connected to the VPN. You can compare Hide my Ass VPN here.