Re: don't go with just one supplier
Its worth pointing out that it doesn't matter how diverse the lines leave your building are if the entry point to the backhaul (exchange, datacentre, whatever) is otherwise constrained.
If I put a spade through a cable outside my house, I lose my internet.
Put a digger shovel through some ducting outside an exchange...
We have heard the tales on here about "multiple points of entry" that ultimately come from the same duct.