"their main difference" is a perfectly correct and usable phrase in written English.
For example, you could use it in a sentence like: "Their main difference was that one was a hardcover book, while the other was a paperback."
Their main difference is the sequential method used.
These carbazole dyes have similar structures and their main difference lies on the position of their alkyl chain substituent.
Their main difference, though, arises over a decade-old set of rules concerning the treatment of elephants.
Their main difference concerns the way fixed flowrate units are handled, either separately or in conjunction with a fixed load operation, since the former comprise a linear subsystem.
Besides their power levels, their main difference lies in the plasma gas specific mass downstream of the anode attachment almost 10 times lower in GSP than in WSP with correspondingly the plasma temperature 10,000 K higher for WSP.
Their main difference is that in NCTT, "fairness" is highlighted at the granularity of "AC".
We describe the common properties of these algorithms, as well as their main differences.
But he emphasized one of their main differences: that the United States planned not only to give greater authority to international institutions that President George W. Bush often shunned, but also to embrace the creation of some new ones.
Senior Bush administration officials and Kim Kye Kwan, North Korea's top negotiator at the six-nation talks here, said that while their main differences remained unresolved, the talks had proved useful.
The group at the center of the effort the covert commando involved in Saddam Hussein's capture. 1 Future Talks With North Korea The United States and North Korea said that four days of discussions had left their main differences unbridged, but pledged to meet together in smaller working groups.
WHILE finance ministers from the euro zone and the International Monetary Fund bridged their main differences over a bailout for Greece early Tuesday, bringing closer the release of long-delayed emergency aid, what they left undecided means this long-running drama — and the cohesion of the euro union — is far from settled.
