All these categories are a fairly broad generalisation. eg: broadband & cable can cover a wide span of speeds. I'm at the bottom end of broadband (adsl) so I set mine to modem so it gives me more upload control. When I had it set to dsl/cable, I couldn't browse at the same time. adsl & dsl are different. But it's up to one's particular speeds & one's particular needs I guess. Oh & T3 connections are potentially faster than T1. That's if you all into that true speed category. But as RaaF said it's up to you.