With that score and that down payment, no question conventional is the way to go. Even if the rates are higher.
To go into detail of what Gregory and Jeff have mentioned, FHA loans ALWAYS require a 1.75% upfront insurance premium, which is equivalent to a 1.75% fee. Price any conventional loan with 1.75% in discount points and the rate will always be lower than FHA.
FHA also requires monthly mortgage insurance on ALL MORTGAGES amortized longer than 15 years regardless of the down payment. Yes, that means you pay insurance on 30 year loans including ones with a huge down payment. The premium is .55%.
For someone in your situation, you should only consider a FHA loan if, for some reason, you do not qualify for a conventional loan outside the down payment and credit score. FHA does have unique guidelines that conventional loans do not have. There's a chance you may only qualify for a FHA loan if you have a unique scenario.
FHA really shines for clients with average to lower credit scores and smaller down payments. It's also a great alternative to HARP loans for clients who have little to no equity, especially when the lack of equity is due to a 2nd mortgage.
Lastly, FHA is a great option for clients who have less than 80% equity but at least 90% who are looking at 15 year loans. While FHA always requires mortgage insurance on loans longer than 15 years, they only require 10% equity on a 15 year loan to avoid mortgage insurance. Conventional loans always require 20% down regardless of the term.