Many others already answered you, I lived in both cities, I like Ottawa more than Toronto. I just try to say something followed your questions.
消费水平: food is more expensive, especially Chinese food and it is not as good as in Toronto; car insurance is cheaper; clothing is similar; many 消费 & repairing are cost more;
房屋价格 : buy house is much cheaper; rent rooms is similar;
就业: more government job, most but not everyone 必须双语 and many you can study French after you get the job; looked as if more high-Tech job; less 餐馆,超市 job;
环境: more quiet and beautiful, clean, smaller, people nice, not so much traffic;
社区: not as many 社区 service as it in Toronto; many service are not free as it in Toronto;
You can see this post on CFC a few days ago:
http://bbs.comefromchina.com/forum5/thread694492-2.html