The best choice usually comes down to:

1) References: you may want to prioritize working with freelancers or a dev shop you have worked with before, and has resulted in a good experience, or you have recommendation from someone you really trust.

2) Cost: can you afford the option you trust the most? If not, you might need to go with the next one.

3) Commitment: in the case of an extended engagement, will your choice be available, and will the terms remain the same? If not, same as above, go with the next in your list.