Telus ADSL's max speed is a lot lower than Shaw Cable for obvious reasons.
If high download speeds is what you're looking for then Shaw Cable is your best bet. However I've heard many complaints from friends who use Shaw Cable that they receive warnings from Shaw about high uploading bandwidth, as they try to minimize illegal file sharing.
Meanwhile Telus has a 30GB montly bandwidth limit, that they tend to do nothing about if you were to go over the limit.
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