I have both, Telus (100) at home and Shaw (150) in a now rental, So far I find Telus to be far more stable and doesn't ever slow down, I haven't tried the new 150 from Shaw as I bumped it up for the tenants but I suspect it would still have periods where it slows down.
I here upload speeds are far better with Telus but I don't really have a need for it. I guess it's important for gamers etc.
At speedtest.net I got this result, I think this is fast?
Edit: LOL, I missed the part where it says A+ and faster than 96% of Calgary users, yeah
it is fast!