The answer really depends on whether or not you can qualify for mortgage insurance. is the property in a distressed market -- check the pmi zip code table here
http://www.pmi-us.com/map/Do you have the credit score: Conventional you need a 680 credit score.
Do you have reserves to get approved for conventional?
If your case is strong and the property is not in a declining area then conventional will probably be easier. Any hic ups and FHA will be the way to go