When someone sells you an RDP, they are selling you a Windows server you connect to over Remote Desktop Protocol. The RDP part is how you reach it. The server is the thing you are buying.
That distinction matters because it tells you what to compare: cores, memory, storage and where the machine physically sits. Full explanation here.
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Getting connected
Windows has a Remote Desktop client built in. macOS, Android and iOS all have a free Microsoft app. Once you have the IP, username and password, you are one connection away. See how to connect from Windows.
If it feels slow once you are in, it is usually distance rather than the machine. Here is how to work out which.