I am about to build a little server in here and want to create an API for it.

I am deciding what is better and already ruled out SOAP since that thing is a mess in my opinion. I am left with REST and XML-RPC.

I really enjoy XML-RPC, it is really simple to implement and it is regular enough that all clients can use it easily.

These days all the cool kids are doing RESTful stuff, sometimes with a JSON payload or XML document or even HTTP POST variables.

I think those guys always reinvent the wheel for each service. I don't see what one could gain by going with REST over using XML-RPC.

Question:

So, can someone here provide practical reasons for implementing an API using REST+JSON over just using XML-RPC?