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I don't think that's a fair comparison, because on VM you also have a large pipe shared between a much larger number of subscribers at the UBR and core. The whole point is VM has an additional shared last mile whereas xDSL does not. This moves the bottleneck and contention point to another part of the network that doesn't exist in the competing technology.

There's no significant difference between the "large pipe" mechanics at the UBR and at the DSLAM. The difference is caused by the section between those two and the end user - one is shared, the other is not. Upstream of that everything is shared on any ISP and no technology has any advantage over any other.