Loan options for an investment property

[Sada Rafi]

My offer has been accepted and signed. Now, I'm looking at financing options out there and Quicken Loan has been recommended. I am working with them to finalize rates and terms, etc. I am doing a 25% down since as they said it would help lower the rate.  They have been fast in giving pre-approval and on top of it so far. I have never dealt with them and not so sure if I'm getting the best rates. I have asked other local lender with similar rates but they didn't dig deep into my info as QL did. As this is an investment property and not a primary, would anyone care to provide some advice on which loan option suites my need. I am not planning on holding on to the property long term, min 3yrs, max 6yrs.

a) 20yr fixed @ 4.50% total  costs $3100

b)  20yr fixed @ 4.625% total  costs $2700

c)  30yr fixed @ 4.875% total costs $2900

d) 30yr fixed @ 4.99% total costs $2600

thanks!