Vodafone vs Telekom?

We are about to sign up for a year internet subscription. Telekom or Vodafone are our only options. Vodafone is cheaper, with options to upgrade the speed if we need, but I read quite a few bad comments about Vodafone here. The difference would be 9,600ft per year to go with Telekom.

Is the difference between Vodafone and Telekom really 10,000ft?

I'm now looking at Telekom in more detail: 12/2 mbps average speed - this is proposed after I enter my address 150/42 mbps is there basic package

Am I in a place that has terrible internet?