There are many things to consider when you are thinking of buying a home.

Growing Equity: Many people look at their homes as an investment for the future. In general, manufactured homes will decrease in value. The opposite is true with conventional housing. Site built homes are more likely to increase in value and give you more equity over the years than manufactured housing.

Financing: Many lenders won't lend on manufactured housing for this very reason. While sometimes, manufactured homes look simular to site built, segments are not always placed on permanent foundations.
Cost: Many people believe that they can only afford a manufactured home when in many cases, it is just as inexpensive to purchase or build a conventional home. Especially when weighed with the appreciation of value over the years, a conventional home will tend to bring you the most value for your money.