Fan question

Morning folks,
Hope all our buds up in the New England states are doing ok today. Be glad it hit as a Cat 1 storm. One can only imagine what a Cat 3 or 4 might do...

Anyhow, I have a couple questions regarding the cooling fan. I have a choice of two that came off parts cars. Pic attached. Both are 18" fans. Which will do a better job of cooling?
Second. I would like to use a fan clutch. Will I have to get a different fan? I am familiar with old GM tech, a different fan was used in those applications. Just wondering if that was the case for us.
Thanks,
C