With Boeing and Airbus winning north of 200 orders at the Paris Air Show, we decided to check Quant Ratings for the best aerospace and defense stocks to buy, looking at only the most volatile ones. Unlike with flying, in the markets, higher risk can mean higher reward. Aerospace and defense companies are usually safe investments. The industry is consistently steady, due to ongoing government contracts. And with instability in the world, it wouldn't be a surprise to see defense spending increase, and benefiting the industry even more. Here are some of the best aerospace and defense stocks TheStreet Quant Ratings says you should consider looking at. Number 3 is General Dynamics Corporation. With an 'A' rating, the company's strengths can be seen in its revenue growth and increase in net income. 2nd is, Honeywell International. This rating is also an 'A.' Honeywell thrives in its solid stock price performance and notable return on equity. Number 1 is United Technologies Corporation. With an 'A' rating the company flourishes in its increase in net income and notable return on equity. TheStreet Ratings are algorithmic stock picks based on 32 major data points. S&P 500 stocks rated 'buy' yielded a 16-and-a-half-percent return in 2014, beating the S&P 500 Total Return Index by more than 300 basis points. For the full reports on these stocks, you can check out TheStreet.com/QuantRatings.