STP/RSTP/MST in a Metro Ethernet ring

We are building a large Metro ethernet Network . The topology consists of BN ( cat 3550 switches ) on a GIG ethernet ring . We intend to use 14 Building node (3550)siwtches in the ring and then aggregate the Gigabit ring onto a 7609 at the Aggregation site .
Can anybody suggest whether I should use RSTP or MST and minimise the convergence/reconvergence period in cases of fiber cut on the ring .
Hrishikesh

Of the two, RSTP is the simpler techonology, while
MST obviously scales better. There are more edge
cases to consider with MST, and we concluded it
needed lots more lab testing before we would be
comfortable with it. RSTP (in Cisco's Rapid-PVST
version) is very simple to deploy.
We are using Rapid-PVST everywhere we can.

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