Blue looks like an urban asylum. It has no respect to the traditional surroundings of Toronto. Not a sense of market-atmosphere inside. That seems something else than a what market should be.
Green is impressive, for its tribute in aesthetics to the original North Market in 19th century. I would nominate this, but to me something little more radical embodiment is needed, yet able to siphon a bit of market quality that South Market solely cherishes its own.
Orange: a itsy-bitsy mash-up of AGO, Foster's Pharmacy Building interior and a typical Loblaw interior! Nice try but this is not what St. Lawrence is about. That scheme works anywhere but there. Surprisingly, I do love the mechanisms of a proposal it is meant to function in sustainable fashion.
Red: Now we are talking! Open-configurable scheme, airy exterior and interior, bold in style yet respects its function and circulation to its neighbouring areas. This would be a winner by wide margin, with only Green-team's scheme coming close.
Yellow is too conservative, ho-hum in everything. Works as planned, but us Mississaugans want that more than Torontonians would.