.NET remoting is specifically used when you are using only

Microsoft platform. Remoting cannot be used between .net

client and non .NET clients.

Web services though can be used for communication on

MIcrosoft technologies, but their main feature is Platform

Interoperability.

So if you are using client and server supporting .NET

framwork, iwould recommend to use .NET remoting because

you can customise it to great detail and also its faster.

If you are developing for cross platform technologies, you

cannot use .NET remoting. So the only option you have is ot

use web services