First, why is which lender you choose important? The most obvious reason, is of course, cost. When you take out a mortgage loan, you incur a monthly payment associated with a large debt. Therefore, you ought to pay close attention to a loan's cost. And it's not just the interest rate you have to consider. Make sure you find out about additional fees such as an underwriting fee, an origination fee, an appraisal fee, etc. These fees are combined with the interest rate to come up with the Annual Percentage Rate (also known as the APR). It is the APR that you ought to pay the most attention to.
When you have a tight time frame within which to buy a home, a lender's speed becomes important. One lender may be able to underwrite the loan in three days and fund it in one more day while another lender may take a couple of weeks or more. Don't ignore this important aspect of lending.
Convenience may also play a role in who you choose. Does the lender allow you to upload your documents over the internet so that you don't have to mail them? Can you apply for and choose your loan without having to talk to a person? Will the notary for signing the final papers come to you?
When you have decided which lenders you'd like to try out, you might want to verify that they can legally fund loans in your state. You can do this by either contacting the state by phone or using an online search that the state may have on their website. You might find that search function on the Banking or Financial Institutions area of the website.
Besides seeing if the lender is able to provide loans in your state, you may want to verify that it has a valid business license in the state where its corporate headquarters are located. This can also be done online.
Which lender you choose is important, so remember to include these considerations in your decision making process: Cost (pay attention to APR), speed, convenience, and legitimacy. May you choose the best online lender!