I'm choosing an ISP for ADSL2+ and wondering whether speed is likely to vary by ISP. If the connection goes through the same cables to the same exchange then perhaps you'd expect performance to by the same no matter who your ISP is? Or are there other factors at work, eg. ISPs having their own equipment in exchanges, or number of customers sharing a resource, etc?
As you can see I'm no telecomms expert.
Obvously there will be other things to consider - customer service, pricing, etc - but that's not what this question is about.
I'm considering Actrix since they seem well liked, but Telstra have this two months free deal so if there's not going to be a difference in speed or reliability they might be the better option for me.
According to Telecom Wholesale's map we're in an ADSL2+ area (Titahi Bay, Porirua).