BobS
To the best of my knowledge, the order of loan types, from the lowest rates to the highest is as follows:
1. Owner-occupied SFR
2. Non-owner-occupied SFR
3. Commercial Property
4. Raw land or lots.
An exception to #3 being expensive would be if you can snag a SBA loan. Tack on a higher rate to any of the above for poor credit or higher LTV.