To Market to Market to buy a... well, I don't know what exactly, but I'm sure whatever it is you're looking for, you're likely to find it in Market Mall.
Ever since moving to Calgary, this has been my mall of choice. It's got a great selection of stores, it's always clean, and I've never found it to be as crowded as Chinook. I've always found stores here to have better selection than their counter parts in other areas of the city as well (especially lulu).
The drawback for Market Mall is the parking lot on the south side. I've found it to be a bit of a bottleneck for traffic, and now they've got some cement barricades blocking off a couple of the places you could once turn into.
Now, to Market to Market to buy.....?