In our market, and especially in our area, it really doesn't make a huge difference.
What I believe you should be thinking about it maintenance. With a townhome, the outside maintenance, landscaping and exterior of the units are all taken care of through the HOA (Homeowner's Association). With a single family home, you are responsible for those items.
It is really a personal preference. What is the lifestyle you are most interested in? Also, remember that townhome HOA's are usually more expensive that your typical subdivision HOA.
If you are interested in getting more information from a local agent, please contact me at 832-561-3445.