You are liable to get biased opinions lol
Two different cities, cultures and languages.
The bars stay open later in Montreal
Montreal girls come to Toronto...to make 'real' money, a little birdy told me haha

In Toronto you can visit Nathan Phillips Square and have a selfie in front of the 'Toronto' sign...you can't do that in Montreal...just a little temptation for you

But other than that I personally can't help you. But I wish you luck in your final decision.

My top three recommendations are Montreal, Montreal and Montreal. But of these three, the one I would recommend most highly is Montreal.

More ladies/better selection, sexier ladies, more open-minded, better attitude and much better VFM (generally less expensive than Toronto but there are very expensive ladies in Montreal if you want e.g; Monica Del Fiore).