A ladder truck, an angle-grinder, a maxi-scooter and seven minutes. That appears to be all it took for thieves to nab priceless jewelry from the Louvre, the world’s most-visited museum.

The largest companies include Xfinity, Spectrum, Cox, Optimum, Mediacom, and WOW!, each with unique coverage areas, fees, and plan options. This guide compares the top cable internet providers, ...