Which option is the best when service provider want to provision internet, mpls or pure ip cloud. Actually it depends on the cloud of service provider and the services segeregation. Most of the service provider run ip backbone different from the mplsvpn backbone. But when the mpls customer look for the internet services in that case route leaking option is used. This is good and valid option but upto some extent.

If the internet provisoning is increasing drastically int that case it is recommened not to use mpls, the reason for that why should we involve the routers to process more. So the best option is to provision internet from glocal ip routing so that simple forwarding mechanism is used.