Leased line for what purpose? Do you mean a leased line that is point to point or that connects to something run by the operator (such as an ISP)? If it is point to point then it is going to be differences in service levels and what level of equipment they are using at the end points which could make a difference to what you get. For the most part though it will be the service that could be different as 100Mb point to point leased line should work pretty much the same with any provider. QoS is set at the routers/switches at each end and is either under your control or should be set by the provider to what you request if they are providing a managed service.
And you definitely mean a leased line rather than FTTC/FTTP?
Performance generally on lease lines should be very good as you are normally paying for an uncontended service which is why they cost much more. Reliability wise if we are talking FTTP there isn't likely to be much between any supplier. Peering arrangements with the big ISPs should all be pretty good as well so again unlikely to see much difference on average (of course there will always be edge cases). My suspicion is that if you are paying for a like for like service (ie same uptime guarantees, SLA, etc) then you aren't going to see that much difference with a lease line service - very different to the consumer world where levels of contention can be a big issue.
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