If you compare buy to let mortgages to other types, you'll see that, although they are now a sinking ship, they can prove to be quite profitable. The thinking behind a buy to let mortgage is that you're taking out a loan to buy property that you're going to rent. The fee coming from your tenant will help you repay the mortgage and even let you keep some extra money. To compare buy to let mortgages in order to pick one, you need to consider some basics regarding this type of lien.
First, if you wish to compare buy to let mortgages, remember that they're all mid to long-term ventures. Therefore, if you are to compare buy to let mortgages, you need to pick the one that looks more profitable, but that also has low interest rates.