Well, you would pay an extra $10 for the 10Mbps upload on cable, so you save yourself that with VDSL.
Plus some better usage packages compared to anything below 45Mbps on Cale.
DSL does have that dedicated line from the DSLAM to your home. Generally speaking, for the GTA we don't really see congestion issues, it's quite rare.
So really, I would say it comes down the speed you want and usage.