Have used both MacAfee & Trend Micro in Windows 7 and want to buy the licensed version so which one is more recommendable?

Of the two, Trend.

MacAfee & Trend Micro - You have used both the antivirus observe it on the factors like ,

Speed of the computer browser,
How often it deletes or block viruses and there many factors , then decide upon the one that suits your computer well . Because Antivirus softwares depends on which system configuration you have.

Try Microsoft Security Essentials

Less annoying (no popups)
Less intrusive (doesn't slow down computer like the other 2)
Free (no paid version, all the features are there for free)