Investors interested in stocks from the Engineering - R and D Services sector have probably already heard of Aecom Technology (ACM) and Altair Engineering (ALTR) . But which of these two stocks is more attractive to value investors? We'll need to take a closer look to find out.Everyone has their own methods for finding great value opportunities, but our model includes pairing an impressive grade in the Value category of our Style Scores system with a strong Zacks Rank. The Zacks Rank favors stocks with stro ...