Fully-blown end-to-end fibre circuits are as good as it gets.
Not to be confused with Superfast Broadband (FTTC), fibre circuits are uncontended circuits with speeds anywhere from 10Mb/s to 10Gb/s. The circuits provide end-to-end fibre synchronous connections (same upload and download speed) from your local exchange to your premises. No other connection offers the guaranteed speed and service levels of a fully-blown fibre circuit.
MPLS is a wide-area network topology used for organisations with multiple sites. It sees individual circuits specified for each site each of which routes directly to a datacentre where they are ‘tied’ together to form a private multipoint wide area network.
Superfast Broadband has superseded traditional broadband circuits. Where it is available, it sees a large percentage of the copper in a circuit replaced with fibre to minimise losses.