Good question and one that can be very easy or difficult to answer without more information.
They say that it is not what you sell something for it is what you buy it for that makes a good or bad deal.
In this market, townhomes have struggled vs. single family homes, however with that being said, certain area of Georgia have very good resale values of townhomes. Traditionally it takes townhomes longer to sell than single family homes and the rate of appreciation is less with townhomes.
Your agent is more than likely looking out for your best interests but if a townhome is what you want then make sure that you find the best deal available in the area you are looking in. Make sure you get a competitive market analysis done on the neighborhood and any other similar properties within a mile or so of your desired location to make a competitive initial offer.
Right now prices are way down on single family homes but not townhomes. Yet, Townhome sales are way down, I'm talking historically low levels. My analysis of that is that a townhome isn't a great buy....
Of course, townhomes do fit some lifestyle choices and it THERE ARE deals out there for townhomes, but your agent is trying to look out for your best interest in that regard.
If you're locked in on townhomes then let her know, if not, she's giving you good advice.
If you are truly interested in a townhome, then that is what you should be looking at. Pricing of townhomes (great deals etc) are area specific. I would recommend you speak a little further about it with your REALTOR if you have additional questions.
Best of luck to you!