Depending on where you are located there could be specific pros and cons to your area. I can tell you that in NE Ohio for example, new construction gets a City of Cleveland tax abatement that is a real draw to buyers. On the other hand, older homes have the advantage of NE Ohio housing stock with all of the wonderful architectural detail that distinguishess the styles and our area. Where are you? Is the housing stock relatively new anyway? (meaning less than 40 yrs old). Depending on your area builders might be offering amazing give backs if you purchase. It truly depends where you are. Please contact a realtor specializing in your area who can tell you about the various deals that may or not be out there for new construction.
I guess the only other thing I would add is, do you enjoy fixing up homes, doing minor repairs. etc? If so, you might like the older homes. Lots of variables! Good luck with your search!